double crossover

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double crossover

two separate CROSSING-OVER events occurring between CHROMATIDS. In a TEST CROSS involving three genes, progeny that have carried out this process can be identified and usually from the least frequent type of offspring.
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when some 30 workers were replacing a railroad switch at Toyosu Station on Tokyo Metro Co.
Researchers at the Michigan State University, USA, put participants in a 3D setting and stationed each participant at a railroad switch where two sets of tracks veered off.
The railroad switch yard frequently frustrates motorists.