BIOL 2107 Lecture Notes - Lecture 8: Heredity, Spermatogonium, Wild Type
26 Feb 2017
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Document Summary
Two general types of cells in plants and animals. Somatic cells make up vast majority of cells in the organism: in g0 or are actively going through mitosis. Germ cells are precursors to gametes: set aside from somatic cells during embryogenesis, become incorporated into reproductive organs, only cells that undergo meiosis produce haploid gametes. Homologs pair, exchange parts, and then segregate: dna fragment exchange generally happens during meiosis, but there"s evidence that there"s a little chance of dna exchange between homologus pairs and even nonhomologous pairs during mitosis. But generally speaking, it"s juts meiosis and between homologous pairs. Sister chromatids remain intact throughout meiosis i: in mitosis, sister chromatids separate. Maternal and paternal homologs recombine and create new combinations of alleles. After recombination, homologs segregate to different daughter cells. Two different processes: in meiosis i, it"s the dna fragment exchange.
