Can someone please help me?

a) 1:4 (25%)

b) 1:4 (25%)

c) Carrier females have the genotype XFXf.

d) There are four possible genotypes, XFXf, XfXf, XFY, XfY

Explanation:

The mutation for hemophilia is on the X chromosome. Females have two X chromosomes and males have one.

Let's say that the mutated allele is f and the normal allele is F.

A carrier female has the genotype XFXf. A hemophilic man has one X chromosome. and since he is affected, must have the mutated allele. He must have the genotype XfY.

The punnett square below shows the cross

                   XF                     Xf

Xf              XFXf                   XfXf

Y                XFY                   XfY

a) As we saw, carrier females have the genotype XFXf. In the cross, there 1:4 chance that phenotype will occur.

b) A normal male has the genotype XFY. In the cross, there 1:4 chance that phenotype will occur.

c) Carrier females have the genotype XFXf.

d) There are four possible genotypes, XFXf, XfXf, XFY, XfY

answer: 45

explanationyou have to add as well to be it could be