Male Sex Determination

Male sex determination primarily depends on the presence of a Y chromosome, which carries a gene called SRY. During conception, if an egg is fertilized by a sperm carrying the Y chromosome, the embryo develops as male; if the X chromosome is present instead, the embryo develops as female. The SRY gene triggers testes formation, leading to male characteristics, while its absence allows ovaries to develop. This genetic system ensures that sex is determined at conception, influenced by whether the father's sperm carries an X or Y chromosome.