Meiosis 1 and Meiosis 2 By Justin KaSparian

Meiosis

A NUCLEAR DIVISION PROCESS THAT DIVIDES

THE PARENTAL CHROMOSOME NUMBER IN HALF (23 chromosomes)

● MEIOSIS SORTS CHROMOSOMES INTO PARCELS

- NOT ONCE BUT TWICE

● MEIOSIS ONLY OCCURS IN THE GAMETES

IN MEIOSIS I EACH DUPLICATED CHROMOSOME ALIGNS WITH ITS PARTNER, HOMOLOGUE TO HOMOLOGUE; EACH CHROMOSOME IS THEN PULLED APART FROM ITS PARTNER AND THEY EACH END UP IN TWO NEW NUCLEI.

In Meiosis 1 Prophase 1, the duplicated chromosomes start to condense. Each pairs with its homologue and swaps segments. One of the two centrosomes moves to the opposite side of the nuclear envelope and begins to break up.

In Meiosis 1 Metaphase 1, one set of microtubules ties one chromosome to each spindle pole while the other set ties its homologue to the other spindle pole.

In Meiosis 1 Anaphase 1, one of EACH duplicated chromosome moves to a spindle pole. The homologue moves to the opposite pole.

In Meiosis 1 Telophase 1, one of each type of chromosome has arrived at the swindle pole. All chromosomes are still included.

In Meiosis 2, Prophase 2, in each cell one of the two centrioles moves to the opposite side of the cell and a new bipolar spindle forms.

In Meiosis 2 Metaphase 2, the microtubules have alligned all of the still duplicated chromosomes midway between the poles.

In Meiosis 2 Anaphase 2, the single chromatids of each chromosome move apart and are now individual unduplicated chromosomes.

In Meiosis 2 Telophase 2, a new nuclear envelope encloses each parcel of chromosomes so there are now four nuclei; the cytoplasm divides and each of the daughter cells now has a haploid.

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