In 1890 it was observed that all but one pair of chromosomes in an organism were the same. These chromosomes were called autosomes. The remaining pair was called sex chromosomes called X and Y chromosomes. The male gamete called the sperm will either contain an X or Y chromosome that will combine with the X chromosome to make either a male (XY) or female (XX) zygote. Just like autosomes, the sex chromosome X carries dominant and recessive genes that will determine portions of the offspring’s phenotype. The outcome of the genes that are located on the X-chromosome follow the laws of segregation and independent assortment when the dominant and recessive alleles on the X chromosomes are segregated during the meiotic divisions of spermatogenesis and oogenesis. The alleles that are located on the X chromosome allow for three possible genotypes for females (XRXR, XRXr, XrXr) and two for males (XRY, XrY). The combination of these genes code for phenotypic information usually sp

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