Ooc

Kinetochore fibers separate homologues in Meiosis I, and sister chromatids in Meiosis II. Adapted from Alberts, 1994.

chiasma

Fused kinetochores of sister chromatids function as one.

meiotic metaphase I

meiotic anaphase I

chiasma meiotic metaphase I

meiotic anaphase I

Fused kinetochores of sister chromatids function as one.

Brief interphase followed by establishment of separate kinetochores on each sister chromatid.

meiotic metaphase II

Brief interphase followed by establishment of separate kinetochores on each sister chromatid.

Kinetochore fibers of sister chromatids point in opposite directions.

meiotic anaphase II

meiotic metaphase II

Kinetochore fibers of sister chromatids point in opposite directions.

crossing-over process. Anaphase I then adds the independent assortment of chromosomes to create new combinations of genes on different chromosomes. A total of 223 (8.4 million) possible combinations of parental chromosomes can be produced by one person, and recombination further increases this to an almost unlimited number of genetically different gametes.

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