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Question 46

A poultry keeper claims that any two hens with the same feather colour must carry identical alleles for that gene. Why is the claim wrong?

  1. Because feather colour always changes as a bird grows older
  2. Because nothing at all can be said about alleles from the appearance of a bird
  3. Because the dominant form can come from two different allele pairsCorrect answer
  4. Because hens with the same alleles always end up looking different

Explanation

A hen showing the dominant form may hold two dominant alleles or a mixed pair, so two birds of the same feather colour can hold different pairs. It goes too far to say nothing can be read from the way a bird looks, because a hen showing the recessive form has a genotype that its appearance does settle.

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Question 46: A poultry keeper claims that any two hens with the same… · Genetics Basics · Questena