Mendel crossed true-breeding purple-flowered pea plants with true-breeding white-flowered pea plants. All the offspring in the first generation (F1\text{F}_1F1) had purple flowers.
How is this result explained?
The allele for white flowers is dominant, so it masks the purple allele.
Flower color is controlled by multiple genes working together.
The allele for white flowers is recessive, so its trait is not expressed when the dominant purple allele is present.
The offspring's flowers are a physical blend of both parents, resembling purple.
97 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.