| Term | Definition |
| sex cells | cells involved in sexual reproduction |
| male gamate | sperm cell |
| female gamate | egg cell |
| fertilization | fusion of the nuclei of the sperm cell and egg cell |
| zygote | resulting cell from fertilization |
| 46 chromosomes | all human body cells have this |
| homologous pairs | similar in size and shape, and controls the same traits |
| monoploid | half the diploid chromosomes |
| diploid | characteristic number of chromosomes in each body cell |
| gamates | mature sex cells |
| gonads | ovaries and testes |
| meiosis | occurs only in maturing sex cells, consists of two nuclear and cytoplasmic divisions but only one chromosome replication |
| gametogenesis | process by which sperm and eggs are produced |
| spermatogenesis | production of sperm |
| oogenesis | production of eggs cells |
| polar body | small cell |