Chapter 26 Reproduction and Development, Part 1 10.59.31 PM

Chapter 26 Reproduction and Development, Part 1 10.59.31 PM...

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Ch 26: Reproduction Keypoints: Human Chromosomes Gametogenesis Fertilization Fetal development Maintenance of pregnancy Parturition
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Terminology Gonads (testes and ovaries) Produce gametes(spermatozoa and ova) Gametes are from germ cells External genitalia Internal genitalia Autosomes vs. sex chromosomes Meiosis
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Human Chromosomes and Sex Determination How many autosomes? Sex chromosomes? X-linked disorders, mechanism? Examples Barr body = “extra” X- chromosome in female Nondisjunction during meiosis (not in book) Crossover during meiosis (also not in book) Barr Body
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Fig 26-2 SRY (or TDF)
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Human Life Cycle Gametogenesis Review meiosis
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Nondisjunction
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Abnormality Karyotype Down Syndrome: Trisomy 21 Turner Syndrome: X Triple-X Syndrome: XXX Klinefelter Syndrome: XXY Jacob Syndrome: XYY
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Relatively normal lives – but no functional ovaries. 1 in 6,000 birth affected. Monosomy X
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Chapter 26 Reproduction and Development, Part 1 10.59.31 PM...

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