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Crossing over is more likely to occur between genes that are far apart. The farther apart genes are, the greater the probability that crossing over will occur between them. In the example above, we had 8% crossing over.
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Crossing over was first described, in theory, by Thomas Hunt Morgan. The physical basis of crossing over was first demonstrated by Harriet Creighton and Barbara McClintock in 1931.[1] Contents ...
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crossing over: Where a section of one chromosome switches places with the same section from the other chromosome of the pair. This sometimes occurs when a germ cell makes copies of its chromosomes before dividing.
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Unequal crossing over A crossover in which the chromosomal segments exchanged are not equally sized because the breakpoint has occurred at a different place on each homologue.
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Early in her career, she was the first to describe crossing over during meiosis in plants. At the peak of her career, she realized that genes were not immobile on the chromosomes, but could move and rearrange themselves with startling consequences.
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Crossing over The term coined by Morgan and Cattell (1912) for the occurrence of new combinations of linked characters.
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See also: Crossing, Chromosome, Chromosomes, DNA, Meiosis

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