A cat breeder crosses a male cat that is heterozygous for polydactyly (having extra toes), which is caused by an autosomal dominant allele (DDD), with a female cat that has a normal number of toes (dddddd).
Draw a Punnett square diagram to show this genetic cross. Use the following symbols:
Identify the expected genotypes of the offspring, state their corresponding phenotypes, and determine the probability that an offspring will have polydactyly.
Practise AQA GCSE Biology Reproduction with exam-style questions for Foundation and Higher tier. 60 questions covering Sexual and asexual reproduction, Meiosis, Advantages and disadvantages of sexual and asexual reproduction (biology only), DNA and the genome, DNA structure (biology only), Genetic inheritance, Inherited disorders, and Sex determination, matched to the AQA GCSE Biology (8461) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.