Fandom

Psychology Wiki

Nondisjunction

34,203pages on
this wiki
Add New Page
Talk0 Share

Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)


OverviewEdit

Nondisjunction is the failure of chromosome pairs to separate properly during meiosis or mitosis. The result of this error is a cell with an imbalance of chromosomes. When a chromosome is lost, it is called a Monosomy, in which the gamete with the defect will have one or more chromosomes missing from one of its pairs. When a chromosome is gained, it is called a Trisomy, in the case of a human cell it will have a set of 24 chromosomes instead of the usual 23.

A diagram of 2 possible occurrences of nondisjunction in meiosis: (n means 1 copy of each chromosome [haploid cell]) (2n means 2 copies of each chromosome)[diploid cell])

             4n         (duplicated chromosomes in diploid cell)
       /         \       (non-disjunction occurs here)
     3n           1n
   /     \      /     \
n+1  n+1    n-1   n-1   (Two gametes have one extra chromosome and the other 2 are missing a chromosome)
          4n          (duplicated chromosomes in diploid cell)
      /        \
    2n        2n
   /  \    /     \      (non-disjunction occurs here)
  n   n    n+1  n-1     (2 Gametes are normal, but on the right side, one gamete has an extra chromosome, and the other is missing one)

See alsoEdit

External linksEdit

(Great place for in-depth insight on this subject)

This page uses Creative Commons Licensed content from Wikipedia (view authors).

Ad blocker interference detected!


Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.

Also on Fandom

Random Wiki