1/26/11Continued from The Cell- Somatic cells have 46 chromosomes 23 pairs Diploid- Sex cells have 23 chromosomes Haploido The function of mitosis is to replenish the cell populationo Functions of meiosis Create sex cells Reduce chromosomes to half so when cells meet there’s 46 Separate X and Y chromosomes to have sexual differentiation Nondisjunction - When homologous chromosomes fail to separate after crossing over- One egg/sperm has two chromosomes and the other get noneo If one of these eggs/sperm join with another egg/sperm then it will end up with 45 or 47 chromosomeso Trisomy – One from one parent, two from other parent- Autosomal aneploids Sex chromosomes aneploids- Triple X Syndrome o Act as average normal femaleso Reproduce normallyo Not a bad thing- X - Turner’s 45 o Femaleo Infertileo Short ofteno Webbed Necko Usually reproductive developmental problems- XXY – Kleinfelter’s o Maleo Sterileo Sometimes wider hips as well as mammary tissue development- XYY o 20% of men over 6 ft. tallo Fertile- YY and Y o They don’t live Why
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