Two people without cystic fibrosis have a child with cystic fibrosis and a daughter without the disorder.
The daughter later has a child with a man who has cystic fibrosis. No genetic test has been carried out on the daughter.
What is the probability that the daughter's child will have cystic fibrosis?
16\frac{1}{6}61
14\frac{1}{4}41
12\frac{1}{2}21
13\frac{1}{3}31
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.