Human male sex chromosomes


Color enhanced scanning electron micrograph (SEM) of an elongated human female X chromosome and the smaller male Y chromosome. Two paired X chromosomes determine that a person is female. A Y chromosome paired with an X chromosome determines that a person is male. A chromosome is formed from a DNA molecule strand containing gene segments that carry portions of hereditary information. Human beings have 23 Chromosomes. There are two copies of each chromosome in each of our cells, one set from the maternal and the other from the paternal parent.

Credit: Biophoto Associates / Science Source

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