Lecture9DownSyndrome_000

Result two of the gametes have an extra chromosome

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Unformatted text preview: Molecular Biology of the Cell (© Garland Science 2008) Nondisjunction in meiosis I NondisjuncEon (chromosome not separated) occurs in meiosis I  ­ homologous chromosome pairs go to the same daughter cell. Result: Two of the gametes have an extra chromosome, and the other two are missing a chromosome. Nondisjunction in meiosis II NondisjuncEon occurs in meiosis II  ­ sister chromaEds segregate to the same daughter cell. Result: Two of the gametes have normal numbers of chromosome, one has an extra chromosome, and the other one is...
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This note was uploaded on 01/07/2013 for the course BIMM 100 taught by Professor Pasquinelli during the Spring '06 term at UCSD.

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