SCIENCE.

1. Gametes are male or female sex cells with half the normal number of chromosomes. They unite with a cell of the opposite sex in the process of sexual reproduction.
2. Gametes are formed through the process of Meiosis.
3. It is important to reduce the number of chromosomes by half during meiosis because the sex cells produced will match up with another sex cell, forming a zygote cell with the original number of chromosomes.
4. During Metaphase I , homologous chromosomes line up next to each other in the middle of the cell.
5. During crossing over, portions of chromatids break off and attach to adjacent chromatids on the homologous chromosome.
6. Crossing-over takes place during Prophase I.
7. DNA only replicates once during meiosis.
8. Two diploid cells are produced after Meiosis I.
9. Sister chromatids separate during Anaphase II
10. Homologous chromosomes separate during Anaphase I.
11. The ell grows and replicates its DNA during Interphase I.
12. The daughter cells will contain 4 chromosomes at the very end of meiosis.
13. Four haploid cells are formed at the end of Meiosis.
14. A tetrad is formed during Prophase I, and it formed when two homologous chromosomes paired up.
15. In males, Miosis forms four sperm cells.
16. In females, meiosis forms one egg cell.
17. In females, meiosis forms three polar bodies.
18. Spermatids must undergo spermiogenesis in order to become mature sperm cells.
19. Ootid must undergo oogenesis in order to become a mature egg cell.