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

They overwhelmed their visitors in the second half, with Amy Cokayne, Moloney-MacDonald and Jess Breach crossing over before Packer bagged her second of the afternoon.

From BBC • Apr. 25, 2026

Gold traded up 0.8% Friday, and is less than $50 away from crossing over the $5,000-per-ounce threshold for the first time.

From The Wall Street Journal • Jan. 23, 2026

Illia Issaiev hated it when his family fled the fighting by crossing over into Russia.

From Barron's • Dec. 17, 2025

But that was followed by a long stretch in limbo, with albums and tours that were devoured by hardcore fans, without crossing over to the mainstream.

From BBC • Sep. 1, 2025

He says that finally crossing over from slavery to freedom is the most horrifyingest, most bravest thing a slave will ever have to do.

From "Elijah of Buxton" by Christopher Paul Curtis