If a couple are both heterozygous for brown eyes, what is the probability of them having a blue eyed child? 50% 0% 25% 100% 75%

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04-02-2018
Mathematics

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If a couple are both heterozygous for brown eyes, what is the probability of them having a blue eyed child? 50% 0% 25% 100% 75%

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Bryancohen Bryancohen · Answer 1 · 2018-02-04T08:57:52+01:00

Bryancohen Bryancohen

04-02-2018

Let’s say that the alleles are B’s. The alleles are different, so it would be Bb. Cross two of them to get BB, Bb, Bb, and bb. Blue eyes are homozygous recessive, or bb. There is a 1 in 4 chance of having a blue eyed child, or 25%.

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