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

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Example Sentences

See Examples For:

crossing over

Contract signings to purchase homes fell in September to the lowest level on record, as buyers fled the housing market in the wake of the average 30-year mortgage rate crossing over 7%.

From The Wall Street Journal ● Oct. 20, 2026

The world’s largest wildlife crossing over the 101 Freeway in Agoura Hills is barreling toward a Dec. 2 completion date.

From Los Angeles Times ● Oct. 8, 2026

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

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

From BBC ● Mar. 6, 2026

Elisha and his remaining crew had spent eighty-four days crossing over ice, until they found open waters and set sail on the smaller whaling boats.

From "American Spirits" by Barb Rosenstock

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