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jules_78 jules_78
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12 years ago
I have some understanding of meiosis.  Each chromosome (1-23) duplicates and pairs up to give 23 pairs.  The cell then splits to give 11 pairs plus an X or Y chromosome 23 (in males).  I dont understand how it splits again to give an equal amount of chromosomes in each cell with them all containing a 23 chromosome.

I might be completely wrong with all of my understanding, it is confusing me alot.  Can someone please help??
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wrote...
12 years ago
a parent cell with 46 pairs of chromosomes divides into two diploid cells (with 23 pairs of chromosomes each) which then divide into 4 gametes with 23 chromosomes each, thats wat happens in meiosis
wrote...
12 years ago
Four stages can be described for each nuclear division.

Interphase: Before meiosis begins, genetic material is duplicated.
First division of meiosis
Prophase 1: Duplicated chromatin condenses. Each chromosome consists of two, closely associated sister chromatids. Crossing-over can occur during the latter part of this stage.
Metaphase 1: Homologous chromosomes align at the equatorial plate.
Anaphase 1: Homologous pairs separate with sister chromatids remaining together.
Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the homologous pair.

Second division of meiosis: Gamete formation
Prophase 2: DNA does not replicate.
Metaphase 2: Chromosomes align at the equatorial plate.
Anaphase 2: Centromeres divide and sister chromatids migrate separately to each pole.
Telophase 2: Cell division is complete. Four haploid daughter cells are obtained.
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