01:119:115 Lecture 11: Meiosis
17 Jan 2019
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1 pair of sex chromosomes = (xx or xy) Make sure each offspring has same number of chromosomes. Few cells from ovary or testis will go through process of meiosis. Three types of sexual life cycles (sexual reproduction only) Diploid zygote (2n) goes through mitosis => diploid multicellular organisms. Some of diploid multicellular organism go through meiosis => gamete (n) Plants and some algae (alternation of generations = mitosis to meiosis to mitosis) Diploid zygote (2n) goes through mitosis => diploid multicellular organisms (sporophyte) Sporophyte undergo meiosis => haploid cell (spore) (n) Spore undergo mitosis => haploid multicellular organism (gametophyte) (n) Diploid zygote (2n) undergo meiosis => haploid cells (n) Haploid cell goes through mitosis => haploid multicellular organism. Gamete (n) + gamete (n) go through fertilization => zygote (2n) Process of taking diploid cells and making haploid cells. 3 from dad"s sperm (haploid (n) = 3) Cell is still diploid and chromosome have doubled.
