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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.
The xx/xy system is found in most other mammals, as well as some insects Discover how sex chromosomes vary naturally and why biological sex isn't always binary In this system, females have two of the same kind of sex chromosome (xx), while males have two distinct sex chromosomes (xy).
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 x chromosome is larger than y because it carries more instructions The x chromosome has some instructions to make body parts that all people have, and others for body parts that only females have
A karyotype is a complete set of chromosomes from an organism or species This is a human male karyotype In the red box, you see the sex. Female (xx) mammals inherit one x chromosome from each parent, but males (xy) receive an x from their mother and a y sex chromosome from their father.
If the egg receives another x chromosome from the sperm, the resulting individual is xx, forms ovaries, and is female
If the egg receives a y chromosome from the sperm, the individual is xy, forms testes, and is male Sex determination sex determination involves the x and y chromosomes Females have two x chromosomes (xx) Males have one x and one y chromosome (xy)
The presence of the y chromosome triggers male development The absence of the y chromosome leads to female development This simple combination plays a significant role in sexual differentiation. Xx and xy chromosomes are only part of the story
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