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The diagram below shows the association of phenotype and gene expression patterns in five different species. The top portion shows the phylogeny of the five species; below the phylogeny are the phenotypes of the five species; and at the bottom are the expression patterns for three different genes (genes 1, 2, and 3) at two different time points in development (early and late), and in two different locations in the embryo (top and bottom).
-Which gene's expression is associated with the appendage growing in the top segment of species D?
A) Gene 1
B) Gene 2
C) Gene 3
D) Both gene 1 and gene 2
E) Both gene 2 and gene 3

Question

Use the following to answer questions :
The diagram below shows the association of phenotype and gene expression patterns in five different species. The top portion shows the phylogeny of the five species; below the phylogeny are the phenotypes of the five species; and at the bottom are the expression patterns for three different genes (genes 1, 2, and 3) at two different time points in development (early and late), and in two different locations in the embryo (top and bottom). 
-Which gene's expression is associated with the appendage growing in the top segment of species D?
A) Gene 1 
B) Gene 2 
C) Gene 3 
D) Both gene 1 and gene 2 
E) Both gene 2 and gene 3

Quizplus · Accepted Answer

Gene 2's expression is shown in the top segment of species D, which corresponds to the growth of appendages in that location. Gene 1's expression is not associated with this phenotype. Gene 3's expression is not shown in the top segment of any species.

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