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Learn how sex chromosomes determine biological sex and how they differ from gender identity The presence of the y chromosome is crucial for male development Find out how x and y chromosomes work, what genes they carry, and what conditions are linked to them.

Learn about the xy system of sex determination, which is used by many mammals, including humans, some insects, plants and fish If it carries a y chromosome, the offspring will be male (xy) Find out how the y chromosome and the sry gene influence male development, and how xy sex determination differs from zw and other systems.

Xx and xy chromosomes are only part of the story

Discover how sex chromosomes vary naturally and why biological sex isn't always binary Learn about dsds and intersex variations. Learn how the x and y sex chromosomes determine our biological sex and how intersex people differ from typical males and females Explore the history and science of sex chromosomes with examples and illustrations.

Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female The sex chromosomes of human beings and other mammals are designated by scientists as x and y In humans the sex chromosomes consist of one pair of the total of 23 pairs of chromosomes. The xx and xy chromosomes determine biological sex in humans and several other species

Males have one x chromosome and one smaller y chromosome, which mostly contains genes for male development.

Males have one x and one y chromosome (xy) The father contributes either an x or a y chromosome through his sperm If the sperm carries an x chromosome, the resulting offspring will be female (xx)