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Prophase 1

(DNA replication has already occurred) Chromosomes shorten and thicken, nuclear envelope begins to disappear, centrosomes duplicate; diploid

Prometaphase 1

Chromosomes continue to shorten and thicken, nuclear envelope disappears, centrosomes to opposite poles, spindle fibers form and attach to chromosomes, HOMOLOGUES SYNAPSE, CROSSING OVER OCCURS; diploid

Metaphase 1

Homologues line up at the equator in random order, CROSSING OVER STILL OCCURRING; diploid

Anaphase 1

Homologues begin to move to opposite poles, sister chromatids stay intact; diploid

Telophase 1

Nuclear envepoles begin to appear, cleavage furrow begins to form, Cytokinesis will follow; haploid

Prophase 2

(No DNA replication)
Nuclear envelope begins to disappear, centrosomes duplicate, spindle fibers form, chromosomes attach; haploid

Metaphase 2

sister chromatids line up at the equator; haploid

Anaphase 2

Centromeres split and sister chromatids move to opposite poles; haploid

Telophase 2

Nuclear envelopes begin to reappear, cleavage furrows begin to form; haploid

Cytokinesis 2

These are GAMETES.
Spermatogenesis produces 4 sperm cells; Oogenesis produces 1 egg and 3 polar bodies

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