What occurs in crossing over:
| 1. | Recombination |
| 2. | Mutation |
| 3. | Independent assortment |
| 4. | None |
Amount of cellular DNA increases during:
| 1. | Cytokinesis | 2. | Fertilisation |
| 3. | Mutation | 4. | Respiration |
Crossing over that results in genetic recombination in higher organisms occurs between:
| 1. | Non-sister chromatids of a bivalent |
| 2. | Two daughter nuclei |
| 3. | Two different bivalents |
| 4. | Sister chromatids of a bivalent |