Why is the ratio of male to female births roughly 50-50?

Answer 1

Human females have two X chromosomes (XX), while males have an X chromosome and a Y chromosome (XY). During meiosis, these chromosomes segregate into separate gametes. All female ova carry a single X chromosome, while in males, half the sperm carry an X chromosome and half carry a Y chromosome. When these fuse together during fertilization, 50% of the time a sperm with an X will fuse with an ovum carrying an X, to generate an XX individual (female). The other 50% of the time, a sperm with a Y fuses with an ovum carrying an X to generate an XY individual (male). Hence, the 50-50 ratio of males to females is a direct result of half of male sperm carrying an X chromosome and half carrying a Y chromosome.

Answer 2

because your body made it even so you can have it either way, male of female

Answer 3

Actually it's 52 to 48 female being the 52 male being the 48