Mistakes in meiosis
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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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Mistakes in meiosis

MistakesinMeiosis


Nondisjunction

Nondisjunction

  • The failure of homologous chromosomes to separate properly during meiosis.

    What should happen

Nondisjunction


The results

The results

  • If the abnormal gametes is fertilized the results


Polyploidy

Polyploidy

  • the condition where cells have multiple sets of chromosomes

  • usually 3-4 sets

  • Most often found in plants, rare in animals


Examples of polyploidy

Examples of Polyploidy

Diploid & tetraploid

many plants

Octoploidy

strawberries

Triploid

seedless watermelon


Trisomy

Trisomy

  • The zygote has an extra chromosome

  • Organisms with an extra chromosome sometimes survive


Examples of trisomy in humans

Examples of trisomy in humans

  • Trisomy 21: Downs Syndrome

  • Trisomy 18: Edwards syndrome

  • Trisomy 13: Patau syndrome

  • XXY: Klinefelter's syndrome


Monosomy

Monosomy

  • The zygote is lacking a chromosome

  • Organisms lacking one or more chromosomes rarely survive


Examples of monosomy in humans

Examples of monosomy in humans

Monosomy X: Turners Syndrome


Human karyotype

Human Karyotype


Karyotype lab

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


Turnitin com info

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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