Signs determined by genes located on the sex chromosomes are called sex-linked. So, in the X chromosome there is a gene responsible for normal blood coagulation. This gene (denoted by the letter H) is dominant and suppresses the manifestation of the recessive gene (h), which determines reduced blood coagulation. When the X chromosome with the recessive h gene enters the male body, the gene action is detected in the form of a terrible disease – hemophilia, expressed in the inability of blood to clot.
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