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English word XXXX comes from English chromosome
chromosome (English)
(cytology, genetics) A structure in the cell nucleus that contains DNA, histone protein, and other structural proteins.
X chromosome (English)
(genetics) A mammalian sex chromosome. Cells of females have a pair of X chromosomes while cells of males have an X and a Y.
XXXX (English)
Tetrasomy X, a rare chromosomal disorder affecting females, caused by the presence of four X chromosomes instead of two present in the usual human karyotype.