مقارنة بين الانقسام الخيطي والانقسام الاختزالي

مقارنة بين الانقسام الخيطي mitosis والانقسام الاختزالي meiosis:

Mitosis and meiosis compared:

It's really important that you don't get meiosis and mitosis confused! Take some time to look at the table below and make sure you understand all the differences between the two types of cell division.

	Mitosis	Meiosis
Purpose	To make daughter cells identical to the parent cells - eg during growth and repair	To produce sex cells (gametes)
Takes place...	In all cells apart from gametes	In the reproductive organs (ovaries and testes)
Produces how many cells?	Two daughter cells	Four gametes
What happens to number of chromosomes?	Same number as in parent cell	Half as many as in parent cell (The original number of chromosomes is restored when two gametes fuse to form a zygote.)
How do parent and daughter cells differ genetically?	Not at all - genetic material is copied exactly (replicated)	Contain a mixture of chromosomes from two parent gametes - so cannot be identical
Variation between daughter cells?	No - they are clones of each other	Yes - they are genetically different from each other because chromosomes get shuffled up during division