crossing-over

noun
cross·ing-over | \ ˌkrȯ-siŋ-ˈō-vər \

Definition of crossing-over 

: an interchange of genes or segments between homologous chromosomes

First Known Use of crossing-over

1912, in the meaning defined above

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The first known use of crossing-over was in 1912

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crossing-over

noun
cross·ing-over | \ ˌkrȯ-siŋ-ˈō-vər \

Medical Definition of crossing-over 

: an interchange of genes or segments between homologous chromosomes

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occurring twice a year or every two years

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