The sex chromosomes consist of a pair of chromosomes called the X and Y chromosomes in the cells of humans and many other organisms. The X and Y chromosomes were first found in beetles by Nettie Stevens in 1906. She pointed out that cells of feminine beetles had identical searching pairs of each and every of these chromosomes that are several but that male beetles had one set where the chromosomes had been different in features from one another. She called those two chromosomes the X therefore the Y, and found that feminine beetles differed from men in containing two X chromosomes. The exact same situation is additionally present in people where females are XX and men are XY.
The X and Y chromosomes in humans may also be different in features, using the X chromosome being dramatically bigger than the Y.
The X and Y chromosomes do not contain the same genes, unlike the other twenty-two pairs of human chromosomes in which members of a pair share all the same genes with the exception of only about nine shared genes. The Y chromosome provides the genes for determining a male pattern of development, and in the lack of a Y chromosome an embryo will observe a lady pattern of development. Pokračování textu Intercourse chromosomes are specific chromosomes which are taking part in determining the intercourse of a organism.