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Biology and Sex Chromosomal Sex Chromosomal Anomalies

Biology and Sex Chromosomal Sex Chromosomal Anomalies. KEY CONCEPTS. Chromosomal Sex The Basics: 46 Chromosomes, Two Sex Chromosomes, X’s And Y’s Andosperm and Gynosperm The Problematic X Chromosome and Sex-Linked Traits Chromosomal Anomalies

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Biology and Sex Chromosomal Sex Chromosomal Anomalies

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  1. Biology and SexChromosomal SexChromosomal Anomalies

  2. KEY CONCEPTS • Chromosomal Sex • The Basics: 46 Chromosomes, Two Sex Chromosomes, X’s And Y’s • Andosperm and Gynosperm • The Problematic X Chromosome and Sex-Linked Traits • Chromosomal Anomalies • Errors in cell division lead to extra or missing chromosomes • Turner’s Syndrome (X Ø) • Trisomy X Syndrome (XXX) • Klinefelter’s Syndrome (XXY or even XXXY) • Supernumerary Y Syndrome (XYY)

  3. Ovum Sperm Each contributes 23 chromosomes for a total of 46 Always an X An X or a Y

  4. X Chromosome Y Chromosome

  5. XX - Female XY - Male

  6. Ovum Sperm Y-Andosperm X-Gynosperm Each contributes 23 chromosomes for a total of 46 Always an X An X or a Y

  7. XX - Female XY - Male THE PROBLEMATIC X CHROMOSOME Pathological Sex-Linked Traits Hemophilia • Color Blindness • Muscular Dystrophy

  8. KEY CONCEPTS • Chromosomal Sex • The Basics: 46 Chromosomes, Two Sex Chromosomes, X’s And Y’s • Andosperm and Gynosperm • The Problematic X Chromosome and Sex-Linked Traits • Chromosomal Abnormalities • Errors in cell division lead to extra or missing chromosomes • Turner’s Syndrome (X Ø) • Trisomy X Syndrome (XXX) • Klinefelter’s Syndrome (XXY or even XXXY) • Supernumerary Y Syndrome (XYY)

  9. XX - Female XY - Male

  10. Turner’s Syndrome Trisomy X Syndrome In the absence of a “Y” chromosome, these are females.

  11. Klinefelter’s Syndrome Supernumerary Y Syndrome In the presence of a “Y” chromosome, these are males. They are “Pseudo-hermaphrodites”

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