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10 Cards in this Set

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Meiosis: Overall:

Meiosis involves two divisions.

- meiotic cells have an interphase stage before the start of meiosis 1 which is similar to mitosis

- includes G1, S and G2 phases

- after meiosis 1, there is another brief interphase stage which is followed by meiosis 2.

Prophase 1:

- chromosomes pair up so that the chromosomes in each pair are homologous

- once paired up, crossing over occurs

- nuclear membrane starts to break down

- spindle microtubules stretch out from each pole to the equator

Crossing Over

- the exchange of genetic material between non-sister chromatids

Metaphase 1:

- paired up homologous chromosomes line up at the equator

- spindle fibers attached to the chromosomes

- make sure one chromosomes moves to one pole and the other moves to the opposite pole

Anaphase 1:

- homologous chromosomes are separated and pulled to opposite poles

- chromosomes are halved still is comprised of two sister chromatids

- cell membrane starts to prepare for its separation at the equator to form two cells

Telophase 1:

- each chromosomes from the homologous pair are found at the opposite poles

- nuclear membrane reforms around each daughter nucleus

- membrane divides through citokinesis

Prophase 2:

- cell has divided into two daughter haploid cells

- spindle microtubules stretch out from each pole again

- nuclear membrane breaks down

Metaphase 1:

- chromosomes in each cell line up at the equator and the spindle microtubules attach to the centromere of each chromosome

Anaphase 2:

- centromere devised as a result of the spindle microtubules pulling each sister chromatid to opposite poles in both cells

- each sister chromatid then becomes a chromosome

Telophase 2:

- nuclear membrane reforms around the four sets of daughter chromosomes

- cytokinesis results to divide the cytoplasm of the two cells

- the results is four daughter cells each with a haploid set of chromosomes