Fruit-fly eyes are of the compound type, which is structurally very different from the camera-type eyes of mammals. Even the camera-type eyes of molluscs, such as octopi, are structurally quite different from those of mammals

Yet, fruit flies, octopi, and mammals possess very similar versions of Pax-6. The fact that the same gene helps produce very different types of eyes is most likely due to _____. A) the few differences in nucleotide sequence among the Pax-6 genes of these organisms
B) variations in the number of Pax-6 genes among these organisms
C) the independent evolution of this gene at many different times during animal evolution
D) differences in the control of Pax-6 expression among these organisms


D

Biology & Microbiology

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