GLOSSARY: X Chromosome
An X Chromosome is defined as a sex chromosome that usually occurs paired in each female cell and single in each male cell. The sex chromosomes X X are one of the 23 homologous pairs of chromosomes in a female. The X chromosome spans more than 153 million base pairs (the building material of DNA) and represents about 5% of the total DNA in women's cells, 2.5% in men's.
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