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1.) Imagine a species whose eye color is determined by a receptor…

January 9, 2024

1.) Imagine a species whose eye color is determined by a receptor molecule called eyeC. When eyeC is not activated, cAMP levels in the cell are low and blue pigment is produced. When eyeC is activated by the binding of the signal molecule, cAMP levels rise and yellow pigment is produced.

The P allele codes for a version of eyeC that responds to signal molecules and therefore turns on and off, resulting in green eye color (from both blue and yellow pigment). The Q allele codes for a version of eyeC that is ALWAYS activated, even when the signal molecules are not present.

Assuming eyeC functions similarly to MC1R, which of the following statements is the best prediction of the dominance relationship between alleles P and Q as well as the phenotype for PQ individuals ?

A.) Q is dominant over P, and the eye color of PQ is blue

B.) Q is dominant over P, and the eye color of PQ individuals is yellow

C.) P is dominant over Q, and the eye color of PQ individuals is blue

D.) P and Q are codominant, and the eye color of PQ individuals is green

Color, determined, eye, Genetics, Imagine, receptor.., species..

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