In a species of moth, wing colour is controlled by a single gene with two alleles. Allele D D\,D gives dark wings and is dominant to allele ddd, which gives pale wings. Two dark-winged moths have an offspring with pale wings.
What is the probability that their next offspring will have dark wings?
34\frac{3}{4}43
111
12\frac{1}{2}21
14\frac{1}{4}41
186 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.