crossing over

noun

, Genetics.

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

crossing over

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

crossing over

/ krô′sĭng-ō′vər /

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

Word History and Origins

Origin of crossing over¹

First recorded in 1910–15

Example Sentences

Like film actors, film directors—David Fincher with House of Cards, Guillermo del Toro with The Strain—are crossing over into TV.

From The Daily Beast

But the pool of people crossing over was much larger—that year, Border Patrol apprehended three times as many people as in 2012.

From The Daily Beast

Justice Stephen Breyer, ordinarily a liberal vote, was meanwhile crossing over to join the conservative majority.

From The Daily Beast

But a new study suggests that blood testing might be crossing over into mental-health territory.

From The Daily Beast

Few are willing to go on the record about their concerns with crossing over.

From The Daily Beast

A few yards further on, take the level-crossing over the Ypres-Lille Railway.

From Project Gutenberg

Before the level-crossing over the Ypres-Routers railway, take the road to the right.

From Project Gutenberg

After the war was over he would find ways of again crossing over to the great treasure chest in the hidden cañon.

From Project Gutenberg

Then he thought of a scheme of waiting till nightfall and of crossing over under cover of the darkness.

From Project Gutenberg

When the bridge was first opened a small toll was levied for each person crossing over.

From Project Gutenberg