HL Bio - Unit 2: Non-Disjunction

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5 Terms

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Non-Disjunction

  •  If a pair of homologous chromosomes move to the same pole (anaphase I) or both chromatids of a chromosome go to the same side (anaphase II) 

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Errors cause

Errors that occur during the anaphase of meiosis can cause disabilities or death

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Down Syndrome

  • Non-disjunctions In some cases leads to this disability, when there are 3 copies of chromosome 21

    • Symptomes: Hearing loss, heart and vision disorders

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Kinefelter’s Syndrome

Caused by the having multiple X chromosomes (XXY)

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Turner’s Syndrome

Caused by having only one X chromosome (X)