Question

question 7 9.1 pts certain ocean crabs exoskeleton color is polygenic with each dominant allele adding additional pigment. in the ocean darker crabs are harder to see and are more easily able to avoid predators. which genotype below would be the most successful in this environment? aabbcc aabbcc aabbcc aabbcc

Explanation:

The problem is about polygenic inheritance in ocean crabs, where dominant alleles add pigment (making crabs darker). Darker crabs avoid predators better. We need to find the genotype with the most dominant alleles (since more dominant alleles mean more pigment, darker color, and better survival). Let's count dominant alleles:

• \(aabbCC\): Dominant alleles from \(CC\) (2), total dominant alleles = 2.
• \(AABBCC\): Each gene is homozygous dominant. \(AA\) (2), \(BB\) (2), \(CC\) (2). Total dominant alleles = \(2 + 2 + 2 = 6\).
• \(AaBbCc\): Each gene is heterozygous, so 1 dominant allele per gene. Total = \(1 + 1 + 1 = 3\).
• \(Aabbcc\): Dominant alleles from \(Aa\) (1), others are recessive. Total = 1.

Since \(AABBCC\) has the most dominant alleles, it will produce the darkest color, making it most successful in avoiding predators.

Answer:

B. \(AABBCC\)