CellBio5 - Meiosis The basis of Mendelian Genetics Meiosis...

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1 Meiosis The basis of Mendelian Genetics Meiosis and Sexual Reproduction - The Cellular Basis of Mendelian Genetics Most eukaryotic organisms have 2 complete sets of genes—one set donated by the mother, the second set donated by the father The two chromosomes of a pair contain the same genes The pair are called homologs , or homologous chromosomes Human cells have 23 pairs of chromosomes, 46 total
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2 Table 9.1 The number of chromosomes for various organisms Karyotype of a Female, Aligned by Chromosome Size Females have two X chromosomes, males have one X and one Y chromosome Each chromosome actually has 2 chromatids
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3 Meiosis and Sexual Reproduction - The Cellular Basis of Mendelian Genetics Most cells in the body are diploid and contain 2 sets of genes (termed 2 n ) During formation of eggs and sperm, only one set is retained, one set is lost (eggs and sperm are haploid or 1 n) The process of reducing the number of chromosomes to the haploid state is called meiosis The diploid state (2n) is regained when an egg cell is fertilized by a sperm cell The Basis of Genetic Diversity Asexual Reproduction With asexual reproduction as occurs in bacteria, protisits, and certain plants, cells divide by fission Each daughter cell receives the exact same genes as the parent Genetic diversity occurs through random mutation
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This note was uploaded on 10/08/2010 for the course MCDB MCDB 1A taught by Professor Senghuilow during the Summer '09 term at UCSB.

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CellBio5 - Meiosis The basis of Mendelian Genetics Meiosis...

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