lecture7 - • End result is four cells that are haploid...

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Meiosis and Sexual Life Cycles • All sexual life cycles contain two complementary processes: Meiosis (reduces the chromosome number) (2n->n) and Fertilization (restores the chromosome number). (n + n = 2n) • During meiosis, two division cycles occur, Meiosis I and Meiosis II. Each division contains the same stages as mitosis, although there are certain key differences. • Remember: Meiosis occurs ONLY in the sex cells, or germline cells!
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Meiosis Overview • During meiosis I, homologous chromosomes are separated. • During meiosis II, sister chromatids are separated.
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Unformatted text preview: • End result is four cells that are haploid and will become sperm and eggs. During this phase, homologs begin to associate, and crossing over occurs. During this phase, the homologs are aligned on the cell equator. During this phase, the HOMOLOGS are separated as the spindle fibers pull them apart During this phase, two haploid cells with DOUBLED chromosomes have been formed During this phase, four haploid cells with unduplicated chromosomes have been formed. Each single chromatid is now referred to as a chromosome....
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This note was uploaded on 09/23/2009 for the course BIO 150 taught by Professor Schmidt during the Spring '08 term at SUNY Stony Brook.

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lecture7 - • End result is four cells that are haploid...

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