Arches. Photo by Daniel Chia
Nov
14
2010

crossing over

An event that occurs during meiosis. During crossing over, alleles on homologous chromosomes can switch places. This switching of alleles increases the number of possible combinations of alleles, and hence increases the variability of a genome. In other words, crossing over contributes to the ability of two parents to produce offspring that are all very different. Also referred to as ‘recombination.’