AP Biology 11: MEIOSIS VS MITOSIS

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1. Meiosis requires two nuclear divisions;

mitosis requires only one nuclear division.

2. Meiosis produces four daughter nuclei and

four daughter cells; mitosis produces only two.

3. The daughter cells produced by meiosis are

haploid; the daughter cells produced by mitosis are diploid.

4. The daughter cells produced by meiosis are

not genetically identical; the daughter cells produced by mitosis are

genetically identical to each other and to the parental cell.

OCCURRENCES:

- In humans, meiosis occurs only in

reproductive organs to produce gametes.

- Mitosis occurs in all tissues for growth and

repair.

MEIOSIS I:

- PROPHASE I: homologous chromosomes pairs undergo crossing-over

- METAPHASE I: bivalents align at

the metaphase plate

- ANAPHASE I: homologous

chromosomes (with centromeres intact) separate and move to opposite poles; in

mitosis at this stage, sister chromatids separate and move to opposite poles.

MEIOSIS II:

Events of

meiosis II are the same stages as in mitosis. However, in meiosis II, the nuclei contain

the haploid number of chromosomes.