Prevalence of methicillin-resistant Staphylococci species isolated ... by Boa, Tyler T.; Rahube, Teddie O.; Fremaux, Bastien; Levett, Paul N.; Yost, Christopher K. / Journal of Environmental Health.
The X and Y chromosomes, also known as the sex chromosomes, determine the biological sex of an individual: females inherit an X chromosome from the father for a XX genotype, while males inherit a Y chromosome from the father for a XY genotype (mothers only pass on X chromosomes).
In a human, 22 pairs of chromosomes are autosomes, and the other pair determines the gender of the human. Females have two X chromosomes, whereas males have one Y chromosome and one X chromosome. Autosomes are numbered according to their size.