Biology 1001A Lecture Notes - Lecture 9: Xyy Syndrome, Cytoskeleton, Spindle Apparatus
7 Mar 2016
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Each day, our dna damaged by uv, free radicals, carcinogenic substances. Mechanisms by which meiosis generate variation / diversity. Recombination during prophase created new combinations of alleles. Entire end of blue chromosome switches with entire end of red chromosome. 4 backbones get cut and gets reattached. Can also occur during movement of mobile elements (doesn"t have to be so precise) Cells going through meiosis put half blue on top and reds on bottom. Random alignment of tetrads in meiosis 2, replicated chromosomes align independently. Screwing up meiosis 1 does not screw up meiosis 2. Chromatids are pulled apart in meiosis 2, as usual (remember: meiosis 1 pulls apart homologous. Independent assortment/random segregation tetrads may align differently + independently in meiosis 1 (variation), no specific order required. Fungi & algae zygote + spores divides by mitosis. A zonkey is a hybrid between zebra and donkey.
