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Unformatted text preview: Upcoming Topics Cell replication Mitosis Meiosis Mendels Laws Non-Mendelian Inheritance Cell biology DNA Protein synthesis Cell replication Chromosomes Humans have 23 pairs of chromosomes, or 46 chromosomes One maternal set, one paternal set Autosomal pairs are homologous (have all the same loci for genes) Diploid number in somatic (normal) cells Haploid number in gametes (egg and sperm)--so 23 in humans Chromosomes Penicillin has 4 chromosomes, mosquitoes 6, opossums 22, apes 48, and adders tongue ferns 1262. Humans have 46 because 2 of the ape chromosomes merged together. MITOSIS All somatic cells replicate through mitosis. Each chromosome makes a copy of itself. Bivalents , or sister chromatids, are formed. Bivalents line up on the equator of cell and are pulled apart. New cell and nuclear membranes form around two identical cells. MEIOSIS Meiosis is used to create the sex cells (eggs and sperm). Duplication of chromosomes. Formation of tetrads. Crossing-over and recombination ....
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- Winter '08