In a species of beetle, smooth wing cases are caused by the dominant allele SSS. Ridged wing cases are caused by the recessive allele sss.
Two beetles with smooth wing cases reproduce. Each beetle has one parent with ridged wing cases.
Assume each offspring is independent and no new mutations occur.
Calculate the probability that exactly two of four offspring will have ridged wing cases.
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.