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Meiosis

Meiosis. Types of Human Cells. Sex Cells Gametes (germ cells) Eggs and Sperm Somatic Cells All other cells. Questions: 1, 2, 3, 4. Types of Chromosomes. Autosomes – same number in males and females Sex Chromosomes – X or Y Human females: XX Male females: XY

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Meiosis

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  1. Meiosis

  2. Types of Human Cells • Sex Cells • Gametes (germ cells) • Eggs and Sperm • Somatic Cells • All other cells Questions: 1, 2, 3, 4

  3. Types of Chromosomes • Autosomes – same number in males and females • Sex Chromosomes – X or Y • Human females: XX • Male females: XY • Testosterone and other hormones from the Y make a male Question: 5

  4. Humans • 46 chromosomes in a somatic cell (23 pairs) • 23 chromosomes in a gamete Questions: 6, 7

  5. Ploidy • Describes how many sets of different chromosomes a cell has. • n = number of chromosomes in 1 set (haploid number) • Haploid Cells: 1n • Diploid Cells: 2n • In humans, n = 23 (the number of different chromosomes we have) 32/16 Questions: the chart, 8, 9 62

  6. Down Syndrome Questions: 10, 11

  7. Klinefelter’s Syndrome Questions: 12, 13

  8. Cause: Nondisjunction Question: 14

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