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cell division

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cell division

Postby kea2 » Mon Feb 14, 2005 11:35 pm

Which phases differ between mitosis and meiosis? :roll:
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Postby Poison » Tue Feb 15, 2005 4:20 pm

most of the phases differ. have a look at these:

Major differences between mitosis and meiosis.

1. Number of cell divisions and products.
mitosis - one cell division resulting in two daughter cells
meiosis - two cell divisions resulting in four products of meiosis

2. Ploidy (# chromosome sets) per nucleus.
mitosis - 2N to 2N
meiosis - 2N to N to N

3. Synapsis of homologous chromosomes.
mitosis - no pairing
meiosis - pairing at zygotene of prophase I

4. Exchange of genetic material between synapsed homologous chromosomes.
mitosis - does not occur
meiosis - occurs at pachytene of prophase I (first visible at diplotene)

5. Timing of division of centromeres.
mitosis - occurs at anaphase
meiosis - occurs at anaphase II but not at anaphase I

6. Genetic variation.
mitosis - conservative process; does not lead to genetic variation
meiosis - leads to increased genetic variation following recombination (crossing-over)

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