In Sheep, Coat Color Is Influenced by Two Genes

question 51

Multiple Choice

In sheep, coat color is influenced by two genes. Gene A influences pigment production, while gene B produces black or brown pigment. If two heterozygous white sheep resulted in 12 white sheep, 3 black sheep, and 1 brown sheep, which genotype(s) of the white sheep explain this data?

• A) The white sheep could be A_B_ or aabb.
• B) The white sheep must all be A_B_.
• C) The white sheep could be A_B_ or A_bb.
• D) The white sheep must all be aabb.
• E) The white sheep could be A_B_ or aaB_.

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