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The interesting thing is that each pair of pair of pair sets a similar set of genes in pairing up to 22nd pair. For example, our 9th chromosome contains ABO ball group genes. In the 9th chromosome pair, both chromosomes have the same place (locus) ABO blood group genes. Although gene (ally) is the same type (blood group), their expression or form may differ. For example, if a chromosomal genome can be found in A blood group genes and other chromosomes B blood group genes. Here are two similar properties for Alle, although their expression is different for the blood group. There are two different types of the same genes: mutation. This mutation may have been many generations before. This type of mutation is either inactive, which causes a harmful disease, which is responsible for the flexible adaptation. From the above words it can be concluded that We carry two forms for each gene. Who is from a mother and the other is from the father. One of the two genes of the same genes is called the ally. In each case of genes, there are two forms (one mother, one from the other), and in our characteristic traits it is found that the mother is equal to the father. Although the first 22 pairs follow this rule, the 23rd pair is different and the original. Here is the hidden mystery of the static twins sister. 23 chromosomal joint called sex chromosomes. Because this chromosome is responsible for determining the wound sex. For girls, 23 chromosomes have two X chromosomes (XX) and boys have an X and a Y chromosome (XY). Y Chromosome contains SRY gene which is responsible for the formation of boys' testicles. On the other hand, X chromosomes determine the sex of girls as well as the structure of the central nervous system, the function of the muscular function, In addition to photosynthetic cells, the genes carry many more essential features. Because men have XY chromosomes, they carry a single set / copy of X chromosomes X X chromosome genes. In this case, the human body has the ability to work with only one copy even though there are no two copies for each gene, like the previous 22 pairs. But in the case of XX pairing girls, If two chromosomas are equally effective in girls' cells, it is likely that there will be abnormalities in the embryo. This problem has been resolved through the X-deactivation process. In case. If two chromosomas are equally effective in girls' cells, it is likely that there will be abnormalities in the embryo. This problem has been resolved through the X-deactivation process. In case. If two chromosomas are equally effective in girls' cells, it is likely that there will be abnormalities in the embryo. This problem has been resolved through the X-deactivation process.