The Y chromosome is responsible for a male child.
Understanding Sex Determination
Human sex determination is primarily governed by the presence or absence of the Y chromosome. Typically, individuals have 23 pairs of chromosomes, for a total of 46 chromosomes. Of these, two are sex chromosomes.
- Females have two X chromosomes (XX).
- Males have one X and one Y chromosome (XY).
The Role of the Y Chromosome
The Y chromosome is crucial in male sex determination because it carries the SRY gene (Sex-determining region Y). This gene triggers the development of male characteristics in a fetus. Without a Y chromosome and the SRY gene, a fetus will typically develop as female.
According to the reference provided:
Because only males have the Y chromosome, the genes on this chromosome tend to be involved in male sex determination and development. Sex is determined by the SRY gene, which is responsible for the development of a fetus into a male. (28-Sept-2022)
Key Functions of the Y Chromosome:
- SRY Gene: The SRY gene initiates the cascade of events leading to testes development.
- Male Development: Genes on the Y chromosome also play a crucial role in other aspects of male development and fertility.
Table Summarizing Chromosome Sex Determination
| Sex | Sex Chromosomes | Key Gene |
|---|---|---|
| Female | XX | Absent |
| Male | XY | SRY Gene |
Conclusion
In essence, the presence of the Y chromosome and, specifically, the SRY gene on it, dictates that the child will develop as a male. It's a fundamental principle of human biology.
