double X

'double X' can also refer to...


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In Drosophila melanogaster, an acrocentric, double-length X chromosome arising as a radiation-induced aberration. Such double X chromosomes are superior to the ordinary metacentric, attached X chromosomes (q.v.) for most stockkeeping operations, since they do not break up by crossing over with the Y. See also detached X.

Subjects: Genetics and Genomics.

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