Share this entry
heterosis Line breaks: het¦er|osis
Pronunciation: /ˌhɛtəˈrəʊsɪs/

Definition of heterosis in English:


Technical term for hybrid vigour.
Example sentences
  • With overdominance, unlike alleles are postulated to result in a stimulating effect, so that genetic heterozygosity per se produces heterosis.
  • Genetic background, heterosis, and sex differences can all have profound effects on chiasma and recombination frequencies.
  • The fundamental genetic and physiological causes of heterosis remain poorly understood in plants after nearly a century of exploitation in crop improvement.


Early 20th century: from Greek heterōsis 'alteration', from heteros 'other'.

Definition of heterosis in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove adverts and access premium resources