Genes

Genetics as it applies to evolution, molecular biology, and medical aspects.

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cvic1
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Genes

Post by cvic1 » Tue Dec 11, 2007 7:19 am

In humans, the allele for brown eyes (B) is dominant over the allele for blue (b). A couple, one of whom has brown eyes and the other blue, have four children, all with brown eyes. Is this proof that the brown-eyed parent is homozygous dominant? Why?

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alextemplet
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Post by alextemplet » Tue Dec 11, 2007 7:37 am

No because if the parent is heterozygous (Bb) then it's still possible for all four children to inherit the same dominant gene. Unlikely, but possible.
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MrMistery
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Post by MrMistery » Tue Dec 11, 2007 6:20 pm

Update: the 1-gene, 2 alleles hypothesis for the inheritance of eye color is history
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