mitosis, meiosis I & II

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Mitosis Interphase

What happens during interphase (mitosis)?

Cell growth, preparation for division

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Mitosis Prophase

What happens during prophase (mitosis)?

chromosomes condense.

mitotic spindle grows.

centrosome migrates to opposite sides.

nuclear membrane starts to break down.

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Mitosis Prometaphase

What happens during prometaphase (mitosis)?

spindle fibers connect to kinetocores.

kinetocores attach to each centrosome.

nuclear envelope continues to disintegrate.

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mitosis metaphase

What happens during metaphase of mitosis?

chromosomes allign at metaphase plate.

centrosomes arrive at spindle poles.

spindle-assembly checkpoint occurs.

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mitosis anaphase

what happens during anaphase (mitosis)?

sister chromatids separate and move toward poles.

chromosome count doubles.

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mitosis telophase

what happens during telophase (mitosis)?

chromosomes arrive at spindle poles.

nuclear envelope reforms.

chromosomes decondense.

Mitosis Asexual Reproduction

1 cell division

2 daughter cells

daughter cells are clones

meiosis sexual reproduction

2 cell division

4 daughter cells

daughter cells have half the amount of chromosomes

what does meiosis do to the chromosome count

reduce (halves) it

diploid > haploid > diploid

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meiosis prophase 1

what happens during prophase 1 (meiosis)

synapsis: pairs of homologs fuse to eachother at the chiasma

creates new allele combinations

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meiosis metaphase 1

what happens during metaphase 1 (meiosis)?

tetrads allign at metaphase plate

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meiosis Anaphase 1

what happens during anaphase 1 (meiosis)?

pairs pulled apart to poles

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meiosis telophase 1

what happens during telophase 1 (meiosis)?

nuclear envelope reforms

cell divides