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Dictionary » N » Nondisjunction NondisjunctionDefinition noun (In mitosis) The failure of sister chromatids to separate during and after mitosis. (In meiosis) The failure of homologous chromosomes to segregate or to separate during and after meiosis.
This could result to a condition wherein the daughter cells have an abnormal number of chromosomes; one cell having too many chromosomes while other cell having none. Examples of nondisjunction:
Compare: disjunction.
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Results from our forumRegarding Mutation... Down syndrome. It is the cause of 2–3% of observed cases of Down syndrome. 95% of the observed cases of Trisomy 21 is anueploidy caused by meiotic nondisjunction events in the parental gametes (88% in the female gamete, and 7% in the male gamete).
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GOT A QUESTION... The karyotype was taken from a man that had XYY disorder. The question was how does one go about inheriting the XYY disorder. I explained about nondisjunction during meiosis and subsequent formation of gametes. And also, I think the XYY disorder is actually not necessarily inherited genetically, ...
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Down syndrome... you need to determine the chance that a second child would suffer from the condition? My answers: a The most likely cause of trisomy-21 would be nondisjunction b/c firstly it is her sixth child (suggesting that it is not within her phenotype), secondly her age. b ?????
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ChromosomesIf you have XXY or more than 2 Xs and a Y you have something callled Nondisjunction or trisomy. This generally means that you develop down syndrome during development. You can't have a YY because YY only codes for a certain number of chromsomes. You must have ...
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Nondisjunction of chromosomesHello, i know that nondisjunction in chromosomes occur in meiosis II, when the sister chromatids fail to separate and both daughter chromosomes go into the same gamete. My doubt is in this question where i think the correct one is ...
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