EVOLUTION LESSONS

 In order for evolution to be properly understood as a science, ENSI maintains that a thorough introduction to the nature of modern science is a necessary prerequisite to teaching evolution. The lessons included here are intended to do just that.
Intended Audience/Grade Level

 These lessons are intended for use in any high school biology course. However, many can be used in middle school / junior high school, possibly with slight modification depending on teacher's style and approach, and the experience and level of students. Many would likewise be appropriate for use in junior college or lower division university levels.

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Titles in Black Are Still Evolving
ML = "Mini-Lesson"
 LIST OF TITLES  SYNOPSES


TITLES

**EVOLUTION PATTERNS**


Geological/Paleontological Patterns: General

Human Evolution Patterns

Classification, Hierarchy, Relationships

 

**EVOLUTION PROCESSES**


Adaptations, Imperfections, Contrivances

Variation and Natural Selection

Speciation

Macroevolution

 LIST OF TITLES  SYNOPSES


SYNOPSES

 

**EVOLUTION PATTERNS**


GEOLOGICAL / PALEONTOLOGICAL PATTERNS: GENERAL

Date a Rock

Students get simulated "rock samples" which show a "highly magnified" selection of 128 atoms, each sample with a different proportion of the atoms of two different elements: a parent radioisotope, and its daughter product. By counting the parent radioactive atoms and knowing the "half-life" of those atoms, students can figure the number of half-lives since the sample solidified, and therefore the "age" of the sample. This makes a good introductory activity to the Deep Time lesson.

DEEP TIME

 This lesson should effectively and accurately inform students about the high level of confidence we have in the geological ages of an old Earth. At the same time, it should reveal an example of pseudoscience which should be part of any effort to improve science literacy and critical thinking.

Students are taken through a combination of some background information and interactive experiences, and checked frequently by questions to confirm understanding. The narrative includes concepts of isotopes, radioactive decay, half-life, mineral formation, age analyses, fair test questions, and isochrons. The lesson can be used as a one-day team activity, individually in class, or as a self-teaching homework assignment. It is intended to either stand by itself, or to serve as an introduction to the very effective online interactive Virtual Age Dating Tutorial. This lesson would be helpful in Biology, Earth Science, Physical Science, Physics, Chemistry, or Geology classes.

Varve Dating

 Students count the number of varves (annual layers of sediment) in shale billets, taken from the Green River Formation in Wyoming. The count is then extended to reflect the entire 260 meters of sediments where the billets originated, a period of nearly 2 million years during which the annual lake sediments (varves) were laid down. This provides a vivid tangible experience to see real data first hand showing the passage of at least nearly 2 million years for the existence of a large lake, in contrast to a traditional view that the entire Earth is only about 6-10 thousand years.

The History of Everything: Timeline Project (Mini-Lesson)

This excellent online timeline gives students the "Big Picture" , ties everything together, from the Big Bang to the present. Directions and images suitable for all major events in time are downloadable so they can be copied and made available to your students to build. Scale is 1 mm = 1 million years. You have the option of starting at the Big Bang or the beginning of the solar system. Developed by Thomas Atkins (ENSI '92) and student.

Time Machine

Students are taken on a simulated "voyage" backward in time, to the beginning of our planet. They will "witness" that beginning, the origin of life, and a number of key events from then to the present. This becomes a dramatic experience, involving body and mind, helping students to relate physically at least to the relative timing of events in geological and biological history, if not to the absolute vastness of that time.

13 Ways to Tell Time Backwards

Students explore different ways gelogical time can be measured: comparing the time dimensions for each method, the mechanisms of each method, and the materials used

The Great Fossil Find

 Students are taken on an imaginary fossil hunt. Following a script read by the teacher, students "find" (remove from envelope) paper "fossils" of some unknown creature, only a few at a time. Each time, they attempt to reconstruct the creature, and each time their interpretation tends to change as new pieces are "found".

Lengthy Relationships (Mini-Lesson)

Paleontologists occasionally find ancient tracks...footprints...preserved in the rocks. This lesson opens the door to analysing footprints, and gleaning information about body size and activities of the extinct animals that made the tracks.

Teaching About Evolution & Special Creation (Mini-Lesson)

A recent article in the ABT Journal by Anton Lawson presents a clever and interesting activity which provides vivid experience in the Fair-Test approach scientists use to determine the "Best Explanation". Students study a representative collection of fossils from the total geological column, look for patterns of fossil distributions, and raise testable questions about which idea (spontaneous generation, special creation, or evolution) best explains the origin of life's diversity and is consistent with the patterns observed in the fossil record.

VIRTUAL AGE DATING (off site; not an ENSI lesson)

Radioactive Decay Concept,
Isochron Dating Concept
Radiocarbon Dating Concept

Don't miss this excellent tutorial for teaching these three aspects of geological age dating. Each part is totally interactive and animated. Check questions are asked along the way to assess understanding. The final phase of the two dating concept routines provide an opportunity to simulate data collection and analysis. Those who complete a tutorial will have a real sense of achievement and understanding (and will receive a certificate!). Therefore, this online-interactive could be assigned as homework (optional or otherwise - if all students have internet access..


PATTERNS IN TIME: Experience Deep Time & Earliest Fossils

Students gradually build a realistic sense of deep, geological time from familiar linear analogs, e.g. calendars and football fields. They also learn to associate the earliest fossils of specific groups of vertebrates with the geologic time of their emergence, on the now-familiar scale of relative distances from their school. From this, they discover the pattern of gradual vertebrate emergence and how well it consistently fits vertebrate phylogeny.

 

 

HUMAN EVOLUTION PATTERNS

Hominoid Cranial Comparison:

 Students describe, measure and compare cranial casts from contemporary apes (gorillas and chimpanzees, typically), modern humans and fossil "hominins" (erect and bipedal forms evolutionarily separated from apes). ("Hominoid" is the collective term for apes and humans.) The purpose of the activity is for students to discover for themselves what some of the similarities and differences are that exist between these forms.

Chronology Lab (Mini-Lesson)

 Students plot the times of existence for the several species of hominins on a two-dimensional time line chart.

Comparison of Human & Chimpanzee Chromosomes

The banding patterns seen on stained chromosomes from humans and chimpanzees are compared in detail, showing striking similarities. Possible evolutionary relationships are explored, as are the chromosomes and relationships of other apes.

The Chromosome Connection 2

Students are taken on a chromosome comparison "adventure", in which the banding patterns are compared on the chromosomes of humans and apes. Degrees of similarities, and some causes of their differences are explored. Inferences about common origins based on those similarities (like forensic bullet marks) are also examined in a compelling way.

Chromosome Fusion

The banding pattern of our long chromosome #2 closely matches the banding patterns of two shorter chromosomes found in apes. This suggests the likelihood that our #2 chromosome was formed by the head-to-head fusion (merging) of those two shorter chromosomes in an early human ancestor. To test that hypothesis, students search for evidence of this fusion in the DNA of chromosome #2, using online databases (or printouts of same) to seek the sequences typical of terminal DNA (telomeres). In the process, students see how patterns can reveal events of the past, thereby merging elements of both experimental and historical science. They discover the huge amount of DNA in a chromosome, get a sense of gene size and the number of pseudogenes, correlate visible chromosome bands and their contained DNA, and learn to use an accessible resource for further study and inquiry.Modern apes and humans evolved from a common ancestor

Mystery of the Matching Marks (Telomere DNA Search)

This is a molecular probe into human evolution with a forensic flair. When bullet marks from bullets at a crime scene match bullets fired from a suspect gun, this provides compelling evidence of a common origin of the bullets - from the same gun. The same comparison of chromosome banding patterns of the chromosomes from humans and chimpanzees likewise offers compelling evidence of a common origin - a common ancestor. Furthermore, the existence of two shorter chromosomes in chimps that together closely match the long human chromosome #2 suggests the hypothesis that our #2 chromosome formed by the fusion of those two shorter chromosomes after we branched off from that common ancestor. Students test that hypothesis by searching for telomere DNA in the supposed fusion area of our #2 chromosome, and find it! This lesson includes a PowerPoint presentation that orchestrates the above series of experiences: background, preparation for the short lab, and follow-up. It also provides a somewhat more accessible version of the ENSI lesson: "Chromosome Fusion," where students actually search online DNA databases for the telomere sequences.

This lesson is roughly equivalent to the climax phase of the activity that accompanies the WGBH NOVA production "Judgment Day: Intelligent Design on Trial" (first aired 13 November 2007). In that trial, testimony by Prof. Ken Miller includes the chromosome fusion evidence that this lesson explores. In that activity, several different lines of evidence for common ancestry are examined, and students experience the compelling effect of accumulating that evidence, seeing how multiple lines of evidence provide a high level of confidence in their conclusion: that humans and chimps share a common extinct ancestor.

Molecular Sequences & Primate Evolution

 Students compare differences in amino acids in the beta hemoglobin from representative primates, complete a matrix of those differences, and from these data, construct and interpret cladograms as they reflect relationships and timing of divergence. Developed by Craig Nelson and Martin Nickels.

Footsteps in Time: Analyis of the Laetoli Footprints (Mini-Lesson)

The 3.6 million year old tracks of an early hominin ("Lucy") in Laetoli provides a tantalizing opportunity to explore how scientists use patterns of the present to understand the past. What do those footprints tell us? How can we find out? Students measure and corelate their foot lengths and body heights, then use these data to estimate tallness of this Laetoli hominin.

Laetoli Trackway Puzzle

Footprint diagrams were made from the trackway of Australopithecus afarensis ("Lucy's" species) at the Laetoli site in East Africa. They are topographic in nature, showing details of depth and superposition. Students are asked a series of probing questions, some requiring direct observation, others expecting inferences and analysis. This is an excellent example of an historical problem-solving exercise, using clues to derive a likely picture of a past event, very much like crime scene scientists must do. It's also open-ended, where students try to reach a "best explanation" based on the data and reasonable interpretations, with no "correct answer" available.

Classroom Cladogram of Vertebrate/Human Evolution

Students prepare the components for building a Colossal Classroom Cladogram of vertebrate evolution, then put it together, showing the gradual, mosaic accumulation of all of the traits which we, as humans, possess. A major purpose of this is to dramatize the evidence that we (and in fact all living things) didn't suddenly pop into existence, but clearly evolved as an accumulation of traits over vast periods of time. A follow-up discussion helps focus on these concepts.

 

CLASSIFICATION, HIERARCHY & RELATIONSHIPS

Making Cladograms

 Classification can (and should) be used to illustrate more than a mere hierarchical grouping of organisms. This lesson introduces students to the building of cladograms as evolutionary trees, showing how "shared derived characters" can be used to reveal degrees of relationship.

Molecular Biology & Phylogeny

 Amino acid sequences in cytochrome-c are compared for several different animals, and the number of differences found are used to infer degrees of relationship. These data are also compared with a cladogram constructed for those same animals from their anatomical features, providing an example of independent confirmation.

Why Cladistics? (Mini-Lesson)

 This is an easily understood article which explains what cladistics is, why it is useful, how it is applied, and its limitations.

What, If Anything, Is A Zebra? (Mini-Lesson)

 The essay (and reading guide) addresses the issue of cladistics, and some of the problems encountered in the science of Systematics.

Cladistics Is a Zip...Baggie (Mini-Lesson)

A series of nested plastic bags is used as a 3-dimensional Venn diagram to illustrate the hierarchical grouping of organisms based on their shared derived characters, thus forming the basis of a cladogram.

Classification: Arbitrary or Not? An Introduction (Mini-Lesson)

Students working in teams classify furniture, share their categories and rationales, then note how their different schemes vary, perfectly logical and useful, but completely arbitrary. They then see how living organisms are classified, and note how these groupings are natural, nearly always reflecting the same ancestral relationships in nested hierarchies, regardless of the deeper criteria. Such patterns are revealed with a look at several phylogenetic trees of primates. Finally, teachers are encouraged to give their students lab experience collecting data from a variety of primate characteristics (skulls, chromosomes, and hemoglobin), to see for themselves the congruency of those data sets. Based on NABT session by Martin Nickels

Primate Classification (Mini-Lesson)

 Students transfer examples (names) of primates from their location in an outline hierarchy of primate groups into a set of nested boxes reflecting that same hierarchy. A cladogram can then be drawn illustrating how these groups are related in an evolutionary way.

Tutorial: Investigating Evol. Quest. Using Online Molec. Databases

Students are guided through a process by which three questions are addressed by retrieving beta hemoglobin sequences from online databases, and using online tools to compare those sequences in student-selected animals. The questions: (1) Are bats birds, or mammals?; (2) Are whales more closely related to artiodactyls, of perissodactyls?; and (3) should birds be included in the class Reptilia?

What did T. rex taste like? (a UCMP lesson)

The module begins by introducing the three domains of life: bacteria, archaea and eukaryotes, and explains that all living things share a common ancestor. By understanding this single unifying concept, students are able to understand the evolutionary history and relationships of all living things. Students are introduced to the process of illustrating evolutionary relationships with branching diagrams called cladograms. Students learn that once a cladogram has been constructed for a group of organisms, it can be used to answer all kinds of interesting questions based on the shared inherited features of those organisms.

 

 

**EVOLUTION PROCESSES**

ADAPTATIONS, IMPERFECTIONS & CONTRIVANCES

Contrivances: Orchids & the Panda's Thumb (Mini-Lesson)

 Students are assigned to read and discuss selected and edited excerpts from the essays of Stephen Jay Gould on the subject of contrivances.

Blocks & Screws: An Exercise in Contrivances

 Each student is given a block of wood and a screw (or nail), and is asked to put the screw (or nail) into the block, without any tool (like a screwdriver or hammer). Their efforts, with varying success, leads to a discussion of "contrivances", using various items and strategies as make-do ("contrived") tools for which they were not intended, and an exploration of many examples of contrivances and other "imperfections" in the living world, especially in humans. This situation may be better explained by evolution rather than the result of "intelligent design".

Why Don't Whales Have Legs?

 Students are given a variety of materials and are asked to design A heat loss experiment that will result in a reasonable explanation of "Why don't whales have legs?"

 

 

VARIATION and NATURAL SELECTION

Born to Run: Artificial Selection Lab NEW

Students are introduced to the field of experimental evolution by evaluating skeletal changes in mice that have been artificially selected over many generations for the behavioral trait of voluntary exercise wheel running. A video presentation by Dr. Theodore Garland, Jr. of the University of California, Riverside discusses the experimental design and presents the results of the collaborative research on the structural, metabolic, and neural changes in the selected lines of mice. In an inquiry-based activity, students develop hypotheses about the skeletal changes that might occur in the legs of the selected mouse populations and design an investigation using measurements taken from photographed femurs (thigh bones) of mice from both selected lines and non-selected control lines.

Natural Selection: A Cumulative Process

A common criticism of natural selection is "how can it produce novel complex useful structures by pure random chance?" Darwin's answer to this "difficulty", (which he actually raised himself), was that selection is NOT a random process, and furthermore, it is cumulative, which he ably explained. Unfortunately, these facts are seldom included in typical classwork on evolution. It should be a required part for every presentation of natural selection.

This lesson provides an elegant, easy way for students to actually compare Darwin's cumulative non-random selection with the non-cumulative version so often erroneously implied. Students working in pairs attempt to produce a full sequence of 13 cards of one suit (ace - to king). This must be done by shuffling the suit of cards for each round, then checking the cards. Half the teams must look for the full sequence each time, and repeat the process until this is accomplished. The other teams start to "build" their sequence by pulling the ace when it first appears as the top card, then adding to the stack whenever the "next" card for the sequence is shuffled to the top. Discussion clearly reveals how the second method mimics Darwinian natural selection, while the first does not.

Chaos & Order: Living on the Edge

This activity provides an excellent introduction to the concept of biological complexity while at the same time demystifying and debunking Paley's argument that a complex "watch" is compelling evidence requiring a (complex) "watchmaker" (designer or creator). It employs an elegant, simple mathematical exercise to demonstrate this. It involves a randomizing component (a die), and a simple mathematical rule (the non-random component), resulting in the repeated plotting of points. Repeated cycles eventually produce an orderly pattern.

The Natural Selection of Stick-Worms

 Students play the role of birds, go out on the school lawn, and pick up toothpick "stick worms" which have been previously been scattered on the lawn in equal numbers of green-stained and unstained. "Birds" are chased away before the "worm population" drops too low. The number of green and non-green "worms" are compared individually and for the whole class. Discussion relates the experience to the elements of natural selection.

The Natural Selection of Bean Hunters

 A relatively simple scenario in which groups of students go hunting for beans in the lawn. Each group has a different tool (e.g. hand, spoon, fork, etc). There are three different colors of beans. The hunting goes for three rounds (generations), with extinctions and reproduction occurring between rounds.

The Chips are Down: A Natural Selection Simulation

 Demonstrate how natural selection operates, using different colored paper chips to represent prey and a piece of fabric as a background (the environment). The predator (student) will hunt (select chips) to show that the best adapted, by color, are NOT chosen, and others which are poorly adapted (by standing out) ARE chosen. Thus, the best adapted survive and reproduce to pass on their traits. Survivors then "reproduce", and subsequent generations are preyed upon.

Bebbledwark World (Mini-Lesson)

 A very clever, creative multi-generational natural selection simulation, developed by Thomas Atkins (ENSI 92) and Gene Nelson of Fresno, California.

What Darwin Never Saw (Mini-Lesson)

 Video showing recent field work on a twenty two-year study of finch beaks on a small island in the Galapagos, showing natural selection clearly operating in the wild. Includes vignettes of Darwin's life, and the Grant family working and living on the island. Excellent video. Video-notes worksheet helps to guide viewing for students, and facilitates subsequent discussion.

Origami Birds (Mini-Lesson)

 Students participate in a contrived natural selection simulation in which they build and modify simple paper airplanes ("Origami Birds"). Created by Karin Westerling, ENSI 92.

When Milk Makes You Sick (Mini-Lesson)

A Lesson in Lactose Intolerance, which offers evidence of natural selection in human populations, based geographic origins and customs. Developed by Therese Passerini (ENSI 90), presented at Reno NABT, Nov. 1998. (Not yet structured in ENSIweb format, but the lesson is now commercially available from Science Kit & Boreal Labs).

Lamarck vs Darwin: Dueling Theories (ML)

A short article which offers an excellent classroom strategy to help students resolve the all-to-common confusion of Lamarck's mechanism for evolution with Darwinian natural selection. By Richard Firenze.

 

 

SPECIATION

A Step in Speciation (Mini-Lesson)

 Different subspecies of a California salamander are placed on grid map of California according to where samples were collected. Discussion focuses on patterns of their distribution, their likely evolutionary relationships, and probable sequence of formation from the original form (speciation). Very compelling experience of speciation and its role in evolution.

Island Geography and Evolution: A Lizard Tale

Using real data, students develop likely phylogenies for seven related populations of lizards living on the Canary Islands (off the West coast of Africa). Three phylogenetic charts will be constructed, each using different forms of data: geography, geology, morphology, and molecular genetics (DNA comparisons). Serves as an excellent example of MILE: Multiple Independent Line of Evidence, showing at least some degree of similarity of patterns and therefore mutual confirmation of the phylogeny.

 

MACROEVOLUTION

Macro-Evolution: Patterns & Trends (Mini-Lesson)

 Fossil shells of a land snail are arranged by layers of age into a sequence pattern suggesting gradual change, or punctuated equilibria. Variation uses caminalcules in place of fossil shells.

A Peek at the Past: Fosil Patterns (Mini-Lesson)

 Two sets of simulated fossils (caminalcules) are provided as cutouts. Students arrange them on two time scales. One set produces a visual example of "gradualism", the other shows "punctuated equilibria".

Model Choices: What Happened to the Dinosaurs? (ML)

 Students read and discuss articles presenting two alternative models about the extinction of dinosaurs. Criteria scientists use to get the "best" solution are encouraged ("Fair Test" strategy).

Becoming Whales: Discovery and Confirmation

Students will experience the historical discovery of fossils which increasingly link whales to earlier land-dwelling mammals. This experience reveals how scientists can make predictions about past events, based on the theory that whales evolved. Such predictions suggest the age and location of sediments where fossils of early whales would most likely be found. This lesson also provides confirmation, with multiple independent lines of evidence, that there IS a series of intermediate forms, showing gradual accumulation of changes, linking certain terrestrial mammals with modern whales.

Whale Ankles and DNA

Students follow the Becoming Whales lesson with a look at more recent data (ankles and DNA) to see if their findings (and predictions based on those findings) are confirmed and sharpened. Students compare early whale ankle bones with similar ankle bones in other animals. They then compare sample strands of DNA found in suspected relatives to arrive at a conclusion about the closest living relative of whales today.

Case of the Threespine Stickleback

Students begin by seeking to answer a question: "Why have some freshwater populations of threespine stickleback fish lost their pelvic spines and body armor?" Data and analysis take them into some applied genetics and the Evo-Devo work on regulatory genes, where mutations only affect where and when a main gene is expressed, producing major changes in morphology (without fatal effects) on which natural selection can act. This exposes a likely pathway for evolutionary change to happen without the heavy risk that a mutation in a protein-producing gene might bring.

Pseudogene Suite,
Part A: Why Vitamin C Is Needed In Our Diet

Students compare the DNA sequence data for a portion of the rat GULO gene (which helps make vitamin C) to the corresponding sequence in the inactive human GULO gene by translating the sequences and by aligning them. This lays ground work for exploring pseudogenes and the significance of these DNA sequences in recognizing shared common ancestry (Lesson B).

Pseudogene Suite,
Part B: Pseudogenes & Common Ancestry

Students compare the DNA sequence data for a portion of the rat GULO gene to the corresponding sequence in the inactive GULO gene ("pseudogene") in humans, chimpanzees, orangutans, and crab-eating macaques by identifying the shared sequences in their alignment. They compare the pseudogene sequences and note a shared deletion. In addition, students do an alignment for the first 25 codons of the functional human beta globin gene and its pseduogene in humans, gorillas, and chimpanzees, then compare the pseudogenes and again note a shared deletion, as well as two other shared significant differences from the functional human sequence. Such shared deletions provide strong evidence for shared common ancestry (descent with modification), a natural process of macroevolution.

Pseudogene Suite,
Part C: Primate Pseudogenes & Biology Workshop

Students use Biology Workbench to explore DNA sequence data for the GULOP gene in humans, chimpanzees, orangutans, and crab-eating macaques and the beta globin gene and its pseduogene in humans, gorillas, and chimpanzees.

 

 

 

 

 

 LIST OF TITLES  SYNOPSES


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