Question:
A woman carrier for haemophilia marries a normal man. Predict the possible genotypes and phenotypes of the offspring using a Punnett square. Also state percentages.
A woman carrier for haemophilia marries a normal man. Predict the possible genotypes and phenotypes of the offspring using a Punnett square. Also state percentages.
Show Hint
Haemophilia is a sex-linked recessive disorder, which is why it predominantly affects males.
Updated On: Jan 5, 2026
Show Solution
Verified By Collegedunia
Solution and Explanation
Step 1: Parental Genotypes - Carrier Mother: $X^{H}X^{h}$; Normal Father: $X^{H}Y$.
Step 2: Punnett Square - The cross yields four genotypes: $X^{H}X^{H}$ (Normal Female), $X^{H}X^{h}$ (Carrier Female), $X^{H}Y$ (Normal Male), and $X^{h}Y$ (Haemophilic Male).
Step 3: Statistics - (a) Normal males: 25% of total offspring (or 50% of all sons). (b) Carrier for haemophilia: 25% of total offspring (or 50% of all daughters).
Step 2: Punnett Square - The cross yields four genotypes: $X^{H}X^{H}$ (Normal Female), $X^{H}X^{h}$ (Carrier Female), $X^{H}Y$ (Normal Male), and $X^{h}Y$ (Haemophilic Male).
Step 3: Statistics - (a) Normal males: 25% of total offspring (or 50% of all sons). (b) Carrier for haemophilia: 25% of total offspring (or 50% of all daughters).
Was this answer helpful?
0
0
Top PSEB Biology Questions
- Main cause of Klinefelter's syndrome is:
- During spermatogenesis, the number of sperms that are formed from 40 spermatogonia, 30 primary spermatocytes, 25 secondary spermatocytes and 15 spermatids respectively are:
- Emergency contraceptives are effective if used within:
- BOD stands for:
- Transplantation of tissues/organs to save certain patients often fails due to rejection of such tissues/organs by the patient. Which type of immune response is responsible for such rejections?
View More Questions
Top PSEB Questions
- Under which method of valuation of Goodwill, normal rate of return is not required?
- An increase in the value of assets is recorded on which side of the Revaluation Account?
- J, K, L, M are in partnership sharing profits and losses in ratio of 9 : 6 : 5 : 5. 'N' joins the partnership for 20% share. J, K, L and M would in future share profits among themselves as 3 : 4 : 2 : 1. The new profit sharing ratio will be:
- X, Y and Z are three partners sharing profits in the ratio 10 : 7 : 7. Z retired. X and Y decided to share profits in equal ratio. Gaining ratio will be:
- Rent paid to a partner is _________ against profit. (charge/appropriation)
View More Questions