Exchange of chromosome segments during recombination: 1. (ashgi.org)
New technological advances (developed in a collaboration between Nottingham, Bristol University and the company Affymetrix and also Nottingham and the Chinese Academy of Sciences) are now enabling the high throughput detection of single chromosome segments (introgressions) from wild relatives, which carry new genetic variation, introduced into wheat. (sciencedaily.com)
Ordinarily, a long continuous stretch of DNA would be broken up by the reshuffling of maternal and paternal chromosome segments that occurs in each new generation (known as homologous recombination). (scientificamerican.com)