Cells from one animal have two pairs of chromosomes. One pair carries alleles M and m, and the other carries alleles N and n. Two gametes produced by meiosis in this animal are recorded:
| Gamete | Alleles carried |
|---|---|
| X | M and N |
| Y | m and n |
Each gamete fuses with a gamete from another animal. The two gametes from the other animal have the same genetic information.
Explain how the distribution of chromosomes during meiosis could account for the difference between gametes X and Y. Predict whether the two zygotes will be genetically identical, and justify your prediction.
62 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.