The Appearance of Pax-6 in All Animals with Eyes Can

question 21

Multiple Choice

The appearance of Pax-6 in all animals with eyes can be explained in multiple ways.Based on the information given,which explanation is most likely?

• A)Pax-6 in all of these animals is not homologous;it arose independently in many different animal phyla due to intense selective pressure favoring vision.
• B)The Pax-6 gene is really not one gene.It is many different genes that,over evolutionary time and due to convergence,have come to have a similar nucleotide sequence and function.
• C)The Pax-6 gene was an innovation of an ancestral animal of the early Cambrian period.Animals with eyes or eyespots are descendants of this ancestor.
• D)The perfectly designed Pax-6 gene appeared instantaneously in all animals created to have eyes or eyespots.

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