Everything You Ever Wanted to Know About Men's Bodies
Men and women have practically the same set of about 20,000 genes. The only physical difference in their genetic make up is in the sex chromosomes. Only males have a Y chromosome. Although the X chromosome is present in both sexes, there are two copies in females and only one in males.Men are genetically simpler than women. Active X chromosomes are a combination of maternal and paternal cells. Men receive their X chromosomes from their mothers. The Y chromosome contains less than 100 genes, while the X chromosome carries more than 1,500 genes.