Parent genotypes -> gametes -> offspring genotypes -> phenotype -> probability

Question 2 of 5

AQA Combined Science Higher Biology Paper 2 5 marks

AKU is a genetic disorder. Figure 3 shows the inheritance of AKU in one family.

Figure 4
Figure 4 from the source question paper.

A female who has AKU and a male who is heterozygous for AKU plan to have a child. Determine the probability that the child will have AKU. You should: • complete Figure 4 • identify the phenotype of each offspring genotype • use the symbols: A = dominant allele a = recessive allele.

Try from memory first

Compare with the chain after you check.