When two alleles in a heterozygote contribute to a phenotype this is known as: a

Q: When two alleles in a heterozygote contribute to a phenotype this is known as: a

1) Codominance. Codominance occurs when two versions, or “alleles,” of the same gene are present in a living thing, and both are expressed. Instead of one trait being dominant over the other, both traits appear. 2) Half the males and half the females have red eyes.

ID: 144485 • Letter: W

Question

When two alleles in a heterozygote contribute to a phenotype this is known as:

a. Codominance

b. Anticipation

c. Incomplete dominance

d. Dominance

e. Incomplete penetrance

The white locus that controls eye color in Drosophila is located on the X chromosome. Red eyes (W+) are dominant over white (w). If you crosses a homozygous red female fly with a white eyed male, what would you expect for the F1 generation?

a. All flies have white eyes

b. Only the females have red eyes

c. Only the males have red eyes

d. All flies have red eyes

e. Half the males and half the females have red eyes.

Explanation / Answer

1) Codominance.

Codominance occurs when two versions, or “alleles,” of the same gene are present in a living thing, and both are expressed. Instead of one trait being dominant over the other, both traits appear.

2) Half the males and half the females have red eyes.

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When two alleles in a heterozygote contribute to a phenotype this is known as: a

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