In a cross between snails, each offspring has an equal chance of having a pale shell or a dark shell. The expected ratio of pale-shelled to dark-shelled offspring is 1:11:11:1.
A breeder records the shell colours of offspring from this cross:
| Number of offspring recorded | Pale-shelled offspring | Dark-shelled offspring |
|---|---|---|
| 10 | 6 | 4 |
| 100 | 52 | 48 |
Explain why the results from the two sample sizes differ in how closely they match the expected ratio.
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.