01:119:115 Lecture Notes - Lecture 11: Synapsis, Kinetochore, Centriole
17 Oct 2016
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Lecture 11 - meiosis: introduction to heredity, asexual reproduction. Mutations will occur and there"s nothing the organism can do about it will continue to pass it on. Only thrives in very stable environments: sexual reproduction. When a environment is very stable sexual reproduction is usually found: types of chromosomes (humans) 46 chromosomes = 23 pairs of homologs. 1 pair of sex chromosomes (xx or xy) Comparing the sexual life cycles of different organisms. From conception to production of own offspring. Fertilization and meiosis: sexual reproduction, makes sure each offspring has same # chromosomes, haploid and diploid alternate during life cycle, timing of two events varies among species, overview of human life cycle, other sexual life cycles. Alternation of generations (2n) - multicellular diploid stage (sporophyte) Only 1 diploid stage = single-celled zygote. 4 stages: interphase (g1, s, g2, meiosis i (pmat, interkinesis, meiosis ii (pmat, interphase. Each chromosome composed of 2 sister chromatids (exact copies)
