Answer:
50% of the progeny will be hemophilic
Explanation:
Available data:
- Hemophilia is an X linked recessive affection
- Let us say that the gene for hemophilia is H
- + is the dominant allele ----> X⁺ Normal
- - is the recessive allele ----> X⁻ Hemophilic
Cross: A man who has hemophilia with a woman who is a carrier
Parentals) X⁻ Y x X⁺X⁻
Gametes) X⁻ Y X⁺ X⁻
Punnett square) X⁻ Y
X⁺ X⁺X⁻ X⁺Y
X⁻ X⁻X⁻ X⁻Y
F1)
- 2/4 = 1/2 = 50% pf the progeny will be boys
- 2/4 = 1/2 = 50% of the progeny will be girls
- 2/4 = 1/2 = 50% pf the progeny will be healthy
- 2/4 = 1/2 = 50% of the progeny will be hemophilic
- 1/4 = 25% of the progeny will be healthy carriers girls, X⁺X⁻
- 1/4 = 25% of the progeny will be healthy boys, X⁺Y
- 1/4 = 25% of the progeny will be hemophilic girls, X⁻X⁻
- 1/4 = 25% of the progeny will be hemophilic boys, X⁻Y
