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Codominance Transitional Reasoning Practice

Biology · Heredity · Biology · Non-Mendelian Genetics

1 Biology practice questions on Codominance. Questions that build towards applied reasoning.

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  1. 1.

    A poultry breeder studies an autosomal gene with two codominant alleles, FBF^B and FWF^W, where homozygous FBFBF^B F^B birds have completely black feathers, homozygous FWFWF^W F^W birds have completely white feathers, and heterozygous FBFWF^B F^W birds have distinct black-and-white barred feathers. The breeder crosses two barred birds and records a total of 160 offspring. Which of the following correctly predicts the expected offspring distribution and provides the precise biological rationale distinguishing this inheritance from incomplete dominance?

    • A) 120 barred and 40 white offspring, because one allele demonstrates variable expressivity while the other remains completely recessive.
    • B) 80 black, 40 barred, and 40 white offspring, because the two alleles blend to form an intermediate coloration rather than independent traits.
    • C) 40 black, 80 barred, and 40 white offspring, because both alleles are simultaneously and fully expressed in the heterozygote without blending.
    • D) 120 black and 40 white offspring, because codominant interactions revert to classic dominant-recessive inheritance when crossed across generations.

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