Genetic Disorders

Step 1: Parental Genotypes - Carrier Mother: ; Normal Father: .
Step 2: Punnett Square - The cross yields four genotypes: (Normal Female), (Carrier Female), (Normal Male), and (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).