crossing over

American  

noun

Genetics.

1. the interchange of corresponding chromatid segments of homologous chromosomes with their linked genes.

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crossing over British  

noun

1. biology the interchange of sections between pairing homologous chromosomes during the diplotene stage of meiosis. It results in the rearrangement of genes and produces variation in the inherited characteristics of the offspring See also linkage

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crossing over Scientific  

/ krô′sĭng-ō′vər /

1. The exchange of genetic material between homologous chromosomes that occurs during meiosis and contributes to genetic variability.

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Etymology

Origin of crossing over

First recorded in 1910–15

Example Sentences

See Examples For:

crossing over

The artificial-intelligence build-out has officially begun crossing over to the world of junk bonds, where investors expect to be paid more for taking on bigger risks.

From MarketWatch ● Sep. 23, 2026

“It’s got a great concept. It’s written with Miranda. It’s got like, 11 things that work for it. It’s cool to see it working within country music and also crossing over like crazy.”

From The Wall Street Journal ● Apr. 13, 2026

He said the flight took a route down along Saudi Arabia, before "crossing over Israel".

From BBC ● Mar. 6, 2026

Once hunted to extinction in France, wolves began crossing over from Italy after gaining protected status under the 1979 Bern Convention.

From Barron's ● Feb. 16, 2026

She clicked her tongue and he sped into a trot, crossing over the little bridge near the house, heading south to the archery grounds.

From Anya and the Nightingale by Sofiya Pasternack