CHAPTER 22: THE REPRODUCTIVE SYSTEMS
F. The (Specific) Stages of Meiosis: See Fig 22.6, page 886 and Fig 22.8, page 887.
Meiosis is similar to mitosis in that the chromosomes (DNA) are duplicated prior to the process, however this single replication is followed by two consecutive cell divisions called Meiosis I and Meiosis II.
2. Interphase I:
a.Chromosomes replicate in parent cell;
b.23 pairs of duplicated chromosomes.
3. Meiosis I:See Fig 22.6, page 886
1.Chromosomes shorten & thicken;
2.Nuclear envelope/nucleoli disappear;
3.Mitotic spindle appears;
4.Chromosomes form tetrads (synapsis); (i.e Homologous pairs are arranged together).
See Fig 22.7, page 886.
1.Homologous chromosome pairs line up along metaphase plate.
1.Homologous pairs separate;
2.One member of each pair moves to opposite pole;
3.Cleavage furrow starts to form.
Telophase I and cytokinesis:
1.Cleavage furrow complete;
2.2 daughter cells containing half the chromosome number of parent cell (23 duplicated chromosomes).