Similar, though smaller, differences were also found between boys and girls with normal complements of chromosomes.

ECONOMIST: Genetics and behaviour

Women have two X chromosomes, and a normal copy of the gene will override the defective one.

WSJ: New Outlook for Colorblindness

This dual life-cycle means that, besides disrupting normal cellular activities in the ways that other viruses do, a retrovirus may also disrupt the normal function of its host's chromosomes.

ECONOMIST: Foulpox