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The XY sex-determination system is the sex-determination system found in humansmost other mammalssome insects Drosophilasome snakes, and some plants Ginkgo. In this system, the sex of an individual is determined by a pair of sex chromosomes. Females typically have two of the same kind of sex chromosome XXand are called the homogametic sex.
Scientists have separated the sperm which carry X and Y chromosomes, in a study which could one day have "colossal" implications for choosing the sex of animals including humans. Sperm carry either an X or Y chromosome, which helps to determine the sex of offspring in most mammals. In general, X and Y-carrying sperm are swimming about in semen in equal numbers, which explains why the human population, for instance, is made up of more or less equal numbers of males and females.
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Humans are born with 46 chromosomes in 23 pairs. Most women are 46XX and most men are 46XY. Research suggests, however, that in a few births per thousand some individuals will be born with a single sex chromosome 45X or 45Y sex monosomies and some with three or more sex chromosomes 47XXX, 47XYY or 47XXY, etc.