A faulty allele, DDD, causes an inherited disorder and is dominant to the normal allele, ddd. A man with the disorder and a woman without the disorder have a child who does not have the disorder.
Give the man's genotype.
Give a reason for your answer.
Calculate the probability that another child of the couple will have the disorder.
62 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.