Polydactyly is caused by a dominant allele. Cystic fibrosis is caused by a recessive allele. Which statement is correct?
A child with polydactyly must have two parents who both have polydactyly
A child with cystic fibrosis must have two parents who both have cystic fibrosis
A child with cystic fibrosis must have inherited the faulty allele from both parents
A child with polydactyly must have inherited the faulty allele from both parents
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.