High School

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Individuals from two separate true-breeding strains of white deer mice are crossed, yielding all grey offspring. White is recessive to grey color, based on crossing mice from each strain with a grey mouse. What would explain this result?

A. Incomplete dominance
B. Codominance
C. Epistasis
D. Dominance

Answer :

Final answer:

The result of crossing two true-breeding strains of white deer mice yielding all grey offspring points to incomplete dominance, where the heterozygous phenotype is a mix of the parental traits.

Explanation:

When individuals from two separate true-breeding strains of white deer mice are crossed and produce all grey offspring, this is indicative of incomplete dominance. In incomplete dominance, the phenotype of the heterozygotes is intermediate between the phenotypes of the two homozygotes. Since white is recessive and the offspring are grey rather than either white or another color, it means neither of the parental white alleles is completely dominant over the other, resulting in a blending of the parental traits.

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