Biology Forum › Genetics › Genes
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- December 11, 2007 at 7:19 am #8781
cvic1ParticipantIn 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?
- December 11, 2007 at 7:37 am #79287alextempletParticipant
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.
- December 11, 2007 at 6:20 pm #79315MrMisteryParticipant
Update: the 1-gene, 2 alleles hypothesis for the inheritance of eye color is history
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