How many are sex chromosomes?
One pair (23rd) XX (female) XY (male)
Sex chromosomes are a pair of chromosomes that determine the sex of an organism. In humans, there are two sex chromosomes, X and Y. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). The presence of the Y chromosome dictates the development of male sex characteristics, whereas the absence results in the development of female sex characteristics. Therefore, the sex of an individual is determined by the combination of sex chromosomes they inherit from their parents.
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