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    If a Trait Is Controlled by Two Codominant Alleles of One
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If a Trait Is Controlled by Two Codominant Alleles of One

Question 21

Question 21

Multiple Choice

If a trait is controlled by two codominant alleles of one gene, what phenotypic ratio is expected in the offspring of a mating of two heterozygotes?


A) 2:1
B) 3:1
C) 1:2:1
D) 1:1
E) 4:1

Correct Answer:

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