Question

Brown hair is dominant over red hair. What will the genotypes and phenotypes of the offspring of a cross between a homozygous brown hair person and a heterozygous brown hair person?

Do the process in five steps.

1.

2.

3.

4.

5.

Answer 1

1) The alleles for homozygous brown hair will be BB.

2) The alleles for heterozygous brown hair will be Bb

3) Let's make a punnet square to check for the outcomes:

B b

B BB Bb

B BB Bb

4) The results from the punnet square depict that the phenotype of all the children produced will be brown hair.

5) The punnet square depicts that there will be a 50% probability of the child to carry the heterozygous genome (Bb) and there is also 50% probability for the child to carry homozygous dominant genome (BB).