Figure 1 shows the inheritance of sickle cell anaemia in one family.
Persons 6 and 7 in Figure 1 are expecting another child.
Determine the probability that the child will be a boy with sickle cell anaemia.
You should:
- identify the genotypes of Person 6 and Person 7
- draw a Punnett square diagram showing the possible offspring genotypes
- identify the phenotype of each offspring genotype
- calculate the final probability using the symbols:
- HAH^AHA = normal haemoglobin allele
- HSH^SHS = mutated haemoglobin allele