Trisomy 21: Difference between revisions
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Trisomy 21 is the name given to the most common occuring mutation that leads to [[Down's syndrome|Down's syndrome]]. "[[Trisomy|Trisomy]]" because, due to a nondisjunction event (failed separation of the [[chromosome|chromosome]]), there is an extra copy of [[Chromosome_21|chromosome 21]] in the gamete. And "21" states that the trisomy occurs on chromosome 21. | |||
The non-disjuntion event describes the failure of the chromosome pairs to separate properly during meiosis, either stage 1 or stage 2, thus leading to the trisomy of chromosome 21 where an extra copy of the chromosome is added. | The non-disjuntion event describes the failure of the chromosome pairs to separate properly during meiosis, either stage 1 or stage 2, thus leading to the trisomy of chromosome 21 where an extra copy of the chromosome is added. | ||
Revision as of 08:59, 20 October 2012
Trisomy 21 is the name given to the most common occuring mutation that leads to Down's syndrome. "Trisomy" because, due to a nondisjunction event (failed separation of the chromosome), there is an extra copy of chromosome 21 in the gamete. And "21" states that the trisomy occurs on chromosome 21.
The non-disjuntion event describes the failure of the chromosome pairs to separate properly during meiosis, either stage 1 or stage 2, thus leading to the trisomy of chromosome 21 where an extra copy of the chromosome is added.