Mendel crossed pure-breeding tall pea plants with pure-breeding short pea plants. All of the offspring were tall.
When these offspring were bred together, about one quarter of the next generation were short.
Which conclusion did Mendel make from these results?
Inherited factors for shortness were destroyed in the first generation.
Inherited factors were passed on unchanged, even when they were hidden.
Inherited factors blended together, so the plants became medium height.
Inherited factors for tallness changed into factors for shortness.
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.