| A | B |
|---|
| interphase | The stage of normal growth and development of a diploid cell |
| prophase I | Chromosomes become visible; spindle forms; crossing-over occurs |
| crossing-over | Exchange of some DNA between homologous chromosomes |
| metaphase I | Homlogous chromosomes line up along cell's equator |
| anaphase I | Homologous chromosomes are pulled to opposite poles |
| telophase I | One diploid cell divides into two haploid cells |
| prophase II | Nucleus dissolves, spindle forms in each of two haploid daughter cells |
| metaphase II | Sister chromatids in both haploid cells line up at the cell's equator |
| anaphase II | Sister chromatids are pulled to opposite poles |
| telophase II | Two haploid cells are divided into four haploid cells |
| nondisjunction | Failure of homologous chromosoomes or chromatids to separate |
| spermatogenesis | The formation of sperm cells |
| Oogenesis | The formation of egg cells |
| ovum | Another name for the "egg" |
| independent assortment | The random distribution of chromosomes to egg and sperm cells as they form |
| synapsis | The pairing of homologous chromosomes during Prophase I |
| polar bodies | The small cells that disintegrate during oogenesis |
