Yes, typically boys have an XY chromosome combination which determines their sex.
The presence of the Y chromosome, specifically the SRY gene on the Y chromosome, triggers the development of male characteristics. Here's a breakdown:
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Chromosomes and Sex Determination: Humans have 23 pairs of chromosomes. One pair, the sex chromosomes, determines a person's sex.
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Typical Combinations:
- Females: Typically have two X chromosomes (XX).
- Males: Typically have one X and one Y chromosome (XY).
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The Role of the Y Chromosome: The Y chromosome contains the SRY gene (sex-determining region Y). This gene initiates the development of testes, leading to the production of testosterone and the development of male secondary sexual characteristics.
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Variations: While XY is typical for males, chromosomal variations can occur. For example, Klinefelter syndrome is a condition where males have an XXY chromosome combination. These variations can lead to differences in sexual development and other health conditions. However, these are less common.
In summary, while there can be variations, the standard chromosomal makeup for males is XY.
