49. Short answer questions XI

 

Humans have two sexes, X and Y. In women, there are two X chromosomestwo Y chromosomes, which is a perfect pair. But in men, one is an X chromosome size is short while the other is a Y chromosome of longin men, one is an X chromosome of normal size while the other is a Y chromosome of short  duration. The child's sex is determined by the father'smother'sinherited chromosome in humans. The zygote will develop into a female if the zygote inherits the  YX chromosome. The zygote will develop into a male when it inherits the XY chromosome. The sex of a child is therefore determined by the type of sex chromosome the male gamete contributes. If a woman only has daughters, the reason is that the child has XYXX  sex chromosome pairs. This indicates that in every fusion, the sperm carrying X chromosome fertilized the ovum.