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In non-disjunction, a chromosome may fail to separate during anaphase. One daughter cell will receive both sister chromosomes and the other will receive none.
The cause is a non-disjunction when chromosomes do not separate during the first meiotic division.
C.
Affected individuals have an extra autosome.
Keywords: chromosomes, chromatid, centromere, cell cycle, interphase, mitosis, prophase, metaphase, anaphase, telophase, cytokinesis, meiosis, random segregation, diploid, haploid, Down's syndrome, non-disjunction, trisonomy, chromosome 21, ...
 See also: Chromosome, Chromosomes, Disjunction, Division, Organ
  
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