Gender in humans is determined by the sperm from the father of an individual.
After meiosis, all gametes are haploid and contain 1 sex chromosome.
Female eggs always contain the X as its sex chromosome.
Half of a male's sperms carry a X, half carry a Y chromosome.
- If a X-carrying sperm fertilizes an egg, the offspring is XX and female.
- If a Y-carrying sperm fertilizes an egg, the offspring is XY and male.