If the allele for brown eyes (B) is dominant to the allele for blue eyes (b), what will be the possible genotypes of a person with brown eyes?

Question

rina.r · Answer

Two possibilities:- 



Man could be BB or Bb (homozygous or heterozygous respectively) 

ONE Father = BB 

Woman (mother) has to be bb (as b is recessive allele, it can only result in phenotype of blue eyes if homozygous (both alleles the same). 

Children:- Bb OR Bb (all children will have brown eyes and be heterozygous). 

TWO:- father = Bb 

Children: Bb OR bb OR bB OR bb 

Therefore, in this 2nd case, half the children will have brown eyes (Bb = heterozygous) and half = blue eyes (homozygous recessive). 

Hope this helps.

anonymous · Answer

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