Biology Practice Problems Genetic Counseling Practice Problems Solution: If two parents who are heterozygous for eye color ...

Solution: If two parents who are heterozygous for eye color mate, what is the probability their first two children will have blue eyes (assume they do not have identical twins)? NOTE: In humans, the brown eye color allele (B) is dominant to the allele for blue eye color (b).A. 1/1B. 1/2C. 1/4D. 1/16

Problem

If two parents who are heterozygous for eye color mate, what is the probability their first two children will have blue eyes (assume they do not have identical twins)? 

NOTE: In humans, the brown eye color allele (B) is dominant to the allele for blue eye color (b).

A. 1/1

B. 1/2

C. 1/4

D. 1/16

Solution

If both parents are heterozygous for the trait, the chances of producing an offspring with the recessive trait would be 25% (or 1/4).

But the question was asking for the chance of having TWO children get the recessive trait.

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