| A | B |
|---|
| Meiosis | reduction division |
| tetrad | homologous chromosomes in prophase 1 |
| homologous | same size, shape, and genes |
| centromere | spindle fibers attach |
| crossing over | occurs during prophase 1 |
| division results in haploid cells | first meiotic division |
| second meiotic division | results in gametes |
| oogenesis | egg formation |
| spermatogenesis | sperm formation |
| gametogenesis | purpose of meiosis |
| polar body | tiny cell left over from oogenesis |
| germ cells | divide to form sex cells |
| gametes | sex cells |
| location of germ cells | testes and ovaries |
| increases genetic variability | crossing over |
| crossing over | homologous chromosomes exchange segments |
| anaphase 1 | homologous chromosomes separate |
| anaphase 2 | sister chromatids separate |
| gametes are | genetically unique |
| 2N | diploid |
| N | haploid |
| diploid cells | germ cells |
| somatic cells | diploid cells |
| haploid cells | N, one set of chromosomes |
