Question

PLEASE PLEASE HELP!!!

I'm super confused and it's not 50% nor 0%. so cross out these answers and please help me out.

thanks in advance!!!

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%.