crossing over

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

Origin:
1910–15

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World English Dictionary
crossing over
 
n
biology See also linkage 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

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American Heritage
Medical Dictionary

crossing over cross·ing o·ver (krô'sĭng) or cross·ing-o·ver (krô'sĭng-ō'vər)
n.
The exchange of genetic material between homologous chromosomes that occurs during meiosis and contributes to genetic variability.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
crossing over or crossing-over   (krô'sĭng-ō'vər)  Pronunciation Key 
The exchange of genetic material between homologous chromosomes that occurs during meiosis and contributes to genetic variability.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
For every deletion, something that happens during an unequal recombination or
  crossing over, a duplication occurs.
All in all, crossing over has been rewarding and fun.
By crossing over the polar region, planes are able to fly shorter distances and
  burn less fuel.
He would no more think of crossing over to acids or paints than to poetry.
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