1 26 11 Continued from The Cell Somatic cells have 46 chromosomes 23 pairs Diploid Sex cells have 23 chromosomes Haploid o The function of mitosis is to replenish the cell population o Functions of meiosis Nondisjunction Create sex cells Reduce chromosomes to half so when cells meet there s 46 Separate X and Y chromosomes to have sexual differentiation When homologous chromosomes fail to separate after crossing over One egg sperm has two chromosomes and the other get none o If one of these eggs sperm join with another egg sperm then it will end up with 45 or 47 chromosomes One from one parent two from other parent o Trisomy Autosomal aneploids Sex chromosomes aneploids Triple X Syndrome o Act as average normal females o Reproduce normally o Not a bad thing X Turner s 45 o Female o Infertile o Short often o Webbed Neck o Usually reproductive developmental problems XXY Kleinfelter s o Male o Sterile o Sometimes wider hips as well as mammary tissue development XYY o 20 of men over 6 ft tall o Fertile YY and Y o They don t live Why not
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