Chromosomal mutations
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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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Chromosomal Mutations

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Chromosomal mutations

Chromosomal Mutations


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


Chromosomal mutations

  • All female gametes (egg cells) contain an X chromosome

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


Chromosomal mutations

  • 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


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