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Modern Genetic Analysis Glossary
X
X:A ratio The ratio between the X chromosome and the number of sets of autosomes.
X chromosome inactivation The process by which the genes of an X chromosome in a mammal can be completely repressed as part of the dosage compensation mechanism (see dosage compensation and Barr body).
X hyperactivation In Drosophila, the process by which the structural genes of the male X chromosome are transcribed at the same rate as the two X chromosomes of the female combined.
X linkage The inheritance pattern of genes found on the X chromosome but not on the Y.
X-and-Y linkage The inheritance pattern of genes found on both the X and Y chromosomes (rare).
X-ray crystallography A technique for deducing molecular structure by aiming a beam of X rays at a crystal of the test compound and measuring the scatter of rays.

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