The body cells of different organisms contain different numbers of chromosomes.
The Table shows the number of chromosomes in the body cells and in the gametes of four organisms.
Table
| Organism | Number of chromosomes in a body cell | Number of chromosomes in a gamete |
|---|---|---|
| human | 46 | 23 |
| dog | 78 | |
| potato | 24 | |
| fruit fly | 8 | 4 |
Complete the Table.
Body cells are diploid. Gametes are haploid.
State what is meant by haploid.
Explain why gametes must be made by meiosis and not by mitosis.
Meiosis is a source of genetic variation.
Explain why genetic variation is important for a species.
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.