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Sex chromosomes are the genetic elements that define a person's biological sex Learn about dsds and intersex variations. Learn about the xx and xy chromosomes, the sex determination system, and other chromosome combinations.

Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female Discover how sex chromosomes vary naturally and why biological sex isn't always binary 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.

Learn how the x and y chromosomes carry instructions that decide our biological sex Find out how the sry gene on the y chromosome and the x chromosome differences affect male and female development. You probably remember this legendary illustration in a biological textbook Sex chromosome (chromosome) is a microscope, female is xx and male is xy.

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. Xx and xy chromosomes are only part of the story

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