Determine the father's genotype.

a) Step 1: Determine the father's genotype. The man suffers from haemophilia, which is a sex-linked recessive condition. Since 'h' represents the allele for haemophilia, his genotype is $X^h Y$. Step 2: Determine the mother's genotype. The woman is described as normal, but their daughter, Mercy, is haemophiliac. For Mercy to be haemophiliac, her genotype must be $X^h X^h$. She inherits one $X^h$ from her father ($X^h Y$) and one $X^h$ from her mother. Since the mother is phenotypically normal but carries the haemophilia allele, her genotype must be $X^H X^h$ (a carrier). The genotype of the parents are: Father: $\boxed{X^h Y}$ Mother: $\boxed{X^H X^h}$ b) Step 1: Identify the gametes produced by each parent. Mother ($X^H X^h$): Gametes are $X^H$ and $X^h$. Father ($X^h Y$): Gametes are $X^h$ and $Y$. Step 2: Construct a Punnett square to show the genotypes of the offspring. $$ \begin{array}{|c|c|c|} \hline \text{Gametes} & X^h & Y \\ \hline X^H & X^H X^h & X^H Y \\ \hline X^h & X^h X^h & X^h Y \\ \hline \end{array} $$ Step 3: List the genotypes of the offspring. The possible genotypes of the offspring are: $X^H X^h$ (Carrier female, normal phenotype) $X^H Y$ (Normal male) $X^h X^h$ (Haemophiliac female) $X^h Y$ (Haemophiliac male) c) Step 1: Determine the probability of a son being haemophiliac. From the Punnett square, the male offspring genotypes are $X^H Y$ (normal) and $X^h Y$ (haemophiliac). There are 2 possible male genotypes, and 1 of them is haemophiliac. The probability of a son being haemophiliac is $\frac{1}{2}$. Probability of son being haemophiliac: $\boxed{\frac{1}{2} \text{ or } 50\%}$ Step 2: Determine the probability of a daughter being haemophiliac. From the Punnett square, the female offspring genotypes are $X^H X^h$ (carrier, normal phenotype) and $X^h X^h$ (haemophiliac). There are 2 possible female genotypes, and 1 of them is haemophiliac. The probability of a daughter being haemophiliac is $\frac{1}{2}$. Probability of daughter being haemophiliac: $\boxed{\frac{1}{2} \text{ or } 50\%}$ Send me the next one 📸