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Meiosis Overview - • synaptonemal complex homologues...

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Meiosis Overview fertilization - aka syngamy; fuses gametes to form a new cell gametes - eggs, sperm somatic cells - nonreproductive cells o has twice as many chromosomes as gametes o never form gametes zygote - formed by 2 gametes fusing together meiosis produces cells w/ 1/2 the normal number of chromosomes sexual reproduction - uses meiosis/fertilization to give chromosomes from 2 parents to offspring o 23 maternal homologues from mother, 23 paternal homologues from father in humans o life cycles of organisms w/ sexual reproduction alternate between diploid/haploid periods germ-line cells - will eventually produce gametes o undergoes meiosis, not mitosis synapsis - close association of chromosomes during prophase I of meiosis
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Unformatted text preview: • synaptonemal complex - homologues paired closely along a protein lattice between them • pairs of homologues come together during metaphase I • homologues, not sister chromatids, go towards opposite poles during anaphase I • meiosis I - aka “reduction division” • crossing over- genetic recombination o homologues can exchange chromosomal information o chiasmata- sites of crossing over, maintained until anaphase I • continued association of chromosome pairs until anaphase is needed to ensure accurate separation 2 divisions- genetic material only replicated once • produces cells w/ 1/2 the number of chromosomes • meiosis II - like mitosis, but without chromosome duplication...
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