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.
76 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.