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Chromosomal Mutations. Karyotype. arrangement of chromosomes from one body cell. Sex Chromosomes. Determine the sex of the individual In humans: X and Y chromosomes X chromosome larger than Y chromosome. All female gametes (egg cells) contain an X chromosome

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Presentation Transcript
karyotype
Karyotype
  • arrangement of chromosomes from one body cell
sex chromosomes
Sex Chromosomes
  • Determine the sex of the individual
  • In humans: X and Y chromosomes
  • X chromosome larger

than Y chromosome

slide4

All female gametes (egg cells) contain an X chromosome

  • Male gametes (sperm) can contain either an X or Y chromosome
slide5

Gender of child determined by father

    • 50% chance child will be male and 50% female
atypical meiosis
Atypical Meiosis
  • Chromosomes do not separate properly during meiosis
  • Results in gametes with too little or too much genetic information
down syndrome
Down Syndrome
  • Zygote contained 47 chromosomes
  • 3 copies of chromosome 21
sex chromosome disorders
Sex Chromosome Disorders
  • Klinefelter syndrome: males born with 2 X chromosomes
  • Turner Syndrome: female born with only 1 X chromosome