Descent with Modification Video Lessons

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Problem: Currently, two extant elephant species (X and Y) are placed in the genus Loxodonta, and a third species (Z) is placed in the genus Elephas. Thus, which statement should be true?a. Species X and Y are not related to species Z.b. Species X, Y and Z share a common ancestor, but nothing more can be claimed than this.c. Species X and Y are the result of artificial selection from an ancestral species Z.d. Species X and Y share a greater number of homologies with each other than either does with species Z. e. Species X and Y share a common ancestor that is still extant (in other words, not yet extinct).

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Problem Details

Currently, two extant elephant species (X and Y) are placed in the genus Loxodonta, and a third species (Z) is placed in the genus Elephas. Thus, which statement should be true?

a. Species X and Y are not related to species Z.

b. Species X, Y and Z share a common ancestor, but nothing more can be claimed than this.

c. Species X and Y are the result of artificial selection from an ancestral species Z.

d. Species X and Y share a greater number of homologies with each other than either does with species Z. 

e. Species X and Y share a common ancestor that is still extant (in other words, not yet extinct).

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