A common Y-linked disorder is male infertility. The son of a woman who is a carrier of a recessive X-linked disorder will have a 50 percent chance of being affected.
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Sex Chromosomes and Sex-Linked Traits
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So females have two copies of every gene, including the genes on sex chromosomes. However, there are other sex determination systems in nature. Clockwise from top left are brown, cinnabar, sepia, vermilion, white, and red. If the sperm cell contains a Y chromosome, then the resulting zygote will be XY or male.
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Sex Determination In humans, as well as in many other animals and some plants, the sex of the individual is determined by sex chromosomes. Females must inherit recessive X-linked alleles from both of their parents in order to express the trait.
Only one of the Y chromosome genes, the SRY gene, is responsible for male anatomical traits. In humans and other mammals, the sex chromosomes are X and Y.
Recessive Carriers When they inherit one recessive X-linked mutant allele and one dominant X-linked wild-type allele, they are carriers of the trait and are typically unaffected. In addition to hemophilia, other X-linked recessive disorders include color blindness, Duchenne muscular dystrophy, and fragile-X syndrome.
Females must inherit recessive X-linked alleles from both of their parents in order to express the trait.