BIOS10162 Chapter Notes - Chapter 11-12: Sister Chromatids, Synapsis, Liver Function Tests
31 Aug 2016
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A broader array of genetic diversity that can face a more stressful environment. Parthenogenesis (embryo develops from unfertilized eggs)- a method of asexual all-female reproduction. Sex and meiosis is pervasive in eukaryotes- they have the capacity even if they don"t do it. Snails correlated asexual and sexual reproducing snails with the conditions of their environment (water quality, population density, individual size) Parthenogenetic snails had greater mutation loads than sexual. Poor quality areas sexually reproducing snails; but still higher population density evades two-fold cost of sex. Too much mutation will become lethal at one point. Sex natural selection acts on genome. Acquisition of homolog pairing (synapses) and its concomitant, homolog separation. Suppression of sister chromatid separation in the first division. Absence of sphase before second division (no dna replication) Mitosis is a universal eukaryotic property all of the machinery needed for it could be found in prokaryotes. Prophase 1 meiosis: pairs of homologs, synapsis and crossing over of homologs.
