An inherited disorder in a population of fish is caused by a recessive allele, ddd. Two carrier fish, each with genotype DdDdDd, are bred. They produce 80 offspring. Assume the expected genotype proportions apply.
Calculate the expected number of offspring that would not have the disorder and the expected number that could not pass allele d d\,d to their own offspring.
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.