
1) Meiosis 2) Miosis 3) Reduction division
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https://www.crosswordclues.com/clue/nondisjunction

Nondisjunction is the failure of chromosome pairs or sister chromatids to separate properly during cell division. Somatic cells, i.e. cells not related to sexual reproduction, like muscle cells, adipocytes, epithelial cells, blood cells, etc., divide by mitosis. Germ line cells divide using a specialized process, called meiosis, to give rise to ga...
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http://en.wikipedia.org/wiki/Nondisjunction

(from the article `heredity`) Some cells have an abnormal number of chromosomes that is not a whole multiple of the haploid number. This condition is called aneuploidy. Most ...
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http://www.britannica.com/eb/a-z/n/49

<genetics, molecular biology> Failure of homologous chromosomes or sister chromatids to separate or segregate at meiosis or mitosis respectively. It results in aneuploid cells, where the daughter cell has two chromosomes or two chromatids and the other has none. ... Nondisjunction of the X chromosome in Drosophila confirmed the theory of chro...
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http://www.encyclo.co.uk/local/20973

(non″dis-junk´shәn) failure either of two homologous chromosomes to pass to separate cells during the first meiotic division, or of the two chromatids of a chromosome to pass to separate cells during mitosis or during the second meiotic division. As a result, one daughter cell has two chromosomes or two chromatids...
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: non′dis-jŭnk′shŭn Definitions: 1. Failure of one or more pairs of chromosomes to separate at the meiotic stage of karyokinesis, with the result that both chromosomes are carried to one daughter cell and none to the other.
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http://www.medilexicon.com/medicaldictionary.php?t=60966

Nondisjunction: Failure of paired chromosomes to disjoin (separate) during cell division so that both chromosomes go to one daughter cell and none to the other. Nondisjunction causes errors in chromosome number such as trisomy 21 (Down's syndrome) and monosomy X (Turner syndrome).
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http://www.medterms.com/script/main/art.asp?articlekey=4577

[
n] - meiosis in which there is a failure of paired homologous chromosomes to separate
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http://www.webdictionary.co.uk/definition.php?query=nondisjunction

an error that occurs during the division of sex chromosomes, causing either too much or too little genetic information to be placed in an egg or sperm when it is formed
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https://www.encyclo.co.uk/local/20875
noun meiosis in which there is a failure of paired homologous chromosomes to separate; results in an abnormal number of chromosomes in the daughter cells
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https://www.encyclo.co.uk/local/20974

The failure of chromosomes to separate properly during cell division. The unequal segregation of chromosomes during meiosis. This forms cells with either too many (possibly one or more single or sets of chromosomes too many) or too few chromosomes. Thought to be a common cause for Down Syndrome, where sufferers often have an extra copy ...
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https://www.encyclo.co.uk/local/21571

the failure of chromosomes to separate and segregate into daughter cells at division.
Found on
https://www.infoplease.com/dictionary/nondisjunction

an error in cell division where the chromosomes fail to disjoin, so that both pass to the same daughter cell.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=glossary-medical-gene
No exact match found.