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

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



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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