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Nondisjunction in Biological Definition

Nondisjunction

... In biology , nondisjunction is the failure of a chromosome to split correctly during meiosis . ... genetic material, and is a common mechanism for trisomy or monosomy . nondisjunction can occur in the meiosis I or meiosis II phases of cellular ...

Down syndrome

... A child with Down syndrome Down syndrome (also called Down's syndrome ) encompasses a number of genetic disorders , of which trisomy 21 (a nondisjunction ) is the most representative, causing highly variable degrees of learning difficulties and physical disabilities . It is named for John ...

Klinefelter's syndrome

... Klinefelter's syndrome is a condition caused by a chromosome abnormality in males (specifically, a nondisjunction ); sufferers have a pair of X sex chromosomes instead of just one. It is named after Harry Klinefelter , the medical researcher who first described ...

Patau syndrome

... syndrome are not inherited, but occur as random events during the formation of reproductive cells (eggs and sperm). An error in cell division called nondisjunction can result in reproductive cells with an abnormal number of chromosomes. For example, an egg or sperm cell may gain an extra copy of chromosome 13. ...
Nondisjunction in Biological Dictionary

Nondisjunction

... nondisjunction is the failure of chromosome pairs to separate ... When the separation is not normal, it is called nondisjunction . ... nondisjunction can occur in the meiosis I or meiosis II, ...

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(Date:12/2/2009)...smoke their first cigarette within minutes after w...-product of nicotine when processed by the body, t...ber of cigarettes smoked. , "Since cotinine l...ur results suggest that smokers who smoke immediat...g cancer," said researcher Joshua E. Muscat, Ph.D....
(Date:12/2/2009)...A Smoky Mountain forest,s woodland herb population...est understories recover from logging, according t...gging in portions of the forest nearly 80 years ag...ndary forest floor was similar to that of undistur...fessor of forestry and natural resources, said tha...
(Date:12/2/2009)... Medical Center researchers have figured out how s... be better able to resist radiation therapy. And u...y in these cancer stem cells, they were able to ki...ratory experiment. , The work builds off earlie...ist the effects of radiation much better than othe...
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