A sequence isolated from the long arm of the human Y chromosome detects a highly homologous locus on the X. This homology extends over at least 50 kb of DNA and is postulated to be the result of a transposition event between the X and Y chromosomes during recent human evolution, since homologous sequences are shown to be present on the X chromosome alone in the chimpanzee and gorilla.
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Bickmore et al. (1987) studied this question.
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