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Mistakes in Meiosis

Mistakes in Meiosis. Nondisjunction. The failure of homologous chromosomes to separate properly during meiosis. What should happen. Nondisjunction. The results. If the abnormal gametes is fertilized the results. Polyploidy. the condition where cells have multiple sets of chromosomes

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Mistakes in Meiosis

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  1. MistakesinMeiosis

  2. Nondisjunction • The failure of homologous chromosomes to separate properly during meiosis. What should happen Nondisjunction

  3. The results • If the abnormal gametes is fertilized the results

  4. Polyploidy • the condition where cells have multiple sets of chromosomes • usually 3-4 sets • Most often found in plants, rare in animals

  5. Examples of Polyploidy Diploid & tetraploid many plants Octoploidy strawberries Triploid seedless watermelon

  6. Trisomy • The zygote has an extra chromosome • Organisms with an extra chromosome sometimes survive

  7. Examples of trisomy in humans • Trisomy 21: Downs Syndrome • Trisomy 18: Edwards syndrome • Trisomy 13: Patau syndrome • XXY: Klinefelter's syndrome

  8. Monosomy • The zygote is lacking a chromosome • Organisms lacking one or more chromosomes rarely survive

  9. Examples of monosomy in humans Monosomy X: Turners Syndrome

  10. Human Karyotype

  11. Karyotype Lab • You will assess a human karyotype and write a letter to explain the chromosomal abnormality to the patient and patient’s family. • You will submit your letter via TurnItIn.com

  12. TurnItIn.com Info • Create a user profile, keep this information somewhere safe! • Student Profile • Class Enrollment Password: Biology • TurnItIn Class ID • 2nd period: 1435724 • 4th period: 1435726 • 6th period: 1435727

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