1a. What happened that prevented Nevo from following up on his experiment after

Question

1a. What happened that prevented Nevo from following up on his experiment after releasing the lizards onto the new island?

Leaping Lizards

2a. List the adaptive traits the lizards had to Pod Kopiste – their original island:

2b. List the adaptive traits the lizards had to Pod Mrcaru – their new island:

2c. In what ways is the environment different on the new island?

2d. How long did it take for these changes in the lizard population to appear?

What Makes a Species

3a. How does the biological species concept define a species?

3b. What does it mean to say species are “reproductively isolated”?

3c. If you were using the morphological species concept to determine whether organisms belong to different species, what would you have to do to determine if they qualify as two species under the biological species definition?

3d. How does geographic isolation provide the framework for populations to gradually diverge into different species?

Read the box “So Many Chromosomes”.

4a. What is meant by “polyploidy”?

4b. How can polyploidy result in the formation of a new species in a single generation?

Caribbean Corals

5a. What did Prada do to determine whether the morphological differences between the shallow-water and deep-water sea fans were genetically based or environmentally based?

5b. What results did Prada and Hellberg find using DNA analysis to study relatedness between deep-water vs shallow-water sea fans (coral)?

Different Depths, Different Habitats

6a. What is the role of algae in the life of corals?

6b. How might these algae be playing a role in the speciation of shallow- vs. deep-water corals?

6c. What is meant by “co-evolution”?

6d. List the four prezygotic reproductive barriers. Give a brief synopsis of what each one entails:

6e. List the two postzygotic reproductive barriers. Give a brief synopsis of what each one entails:

6f. What is the likely reason for the two corals reproductive isolation? Describe the details of this isolation:

Explanation / Answer

Answer 1a

The lizards heads were bigger, their legs had become shorter, they became slower, and the digestive tract had developed new muscular rings that pinched off a section of the gut, forming a changer. In this chamber, plant-feeding worms/bacteria had taken up residence, breaking down tough stems & leaves the lizards couldn't digest on their own.

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