Descent with Modification Video Lessons

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Problem: The Canary Islands are seven islands just west of the African continent. The islands gradually became colonized with life (plants, lizards, birds, etc). Three different species of lizards found on the islands are similar to one species found on the African continent (Thorpe & Brown, 1989). Because of this, scientists assume that lizards traveled from Africa to the Canary Islands by floating on tree trunks washed out to sea.A well-established population of lizards is made up of hundreds of individual lizards. On an island, all lizards in a lizard population are likely to:a. be indistinguishable, since there is a lot of interbreeding in isolated populations.b. be the same on the inside but display differences in their external features.c. be similar, yet have some significant differences in their internal and external features.d. be the same on the outside but display differences in their internal features.

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Problem Details

The Canary Islands are seven islands just west of the African continent. The islands gradually became colonized with life (plants, lizards, birds, etc). Three different species of lizards found on the islands are similar to one species found on the African continent (Thorpe & Brown, 1989). Because of this, scientists assume that lizards traveled from Africa to the Canary Islands by floating on tree trunks washed out to sea.

A well-established population of lizards is made up of hundreds of individual lizards. On an island, all lizards in a lizard population are likely to:

a. be indistinguishable, since there is a lot of interbreeding in isolated populations.

b. be the same on the inside but display differences in their external features.

c. be similar, yet have some significant differences in their internal and external features.

d. be the same on the outside but display differences in their internal features.

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Our tutors rated the difficulty ofThe Canary Islands are seven islands just west of the Africa...as medium difficulty.

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Our expert Biology tutor, Kaitlyn took 5 minutes and 36 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Constable's class at CSU.