Question

Please help me with this!!!

Answer 1

Answer:

e. 25%

Explanation:

• Hemophilia is inherited in the X-linked recessive pattern. This means that two recessive alleles need to be present in an affected individual.
• Since the father is affected, his genotype is $X^{h}$Y.
• The mother is heterozygous i.e. a carrier for the hemophilia allele with the genotype $X^{H}$$X^{h}$.

Punnet Square:        

             $X^{H}$        $X^{h}$

$X^{h}$       $X^{H}$$X^{h}$     $X^{h} X^{h}$

Y          $X^{H} Y$       $X^{h} Y$

• According to the Punnett square above, the probability of an affected daughter i.e. genotype $X^{h} X^{h}$ is 1/4 i.e. 25%.