Muscular dystrophy is a sex-linked recessive disorder. A man with muscular dystrophy morries a woman who doesn't have this disease Half of their ddoghters and half of their sons develop this disease. What is the genotype of the mother? x^n x^Nx^n x^N

The correct answer is .Muscular dystrophy is a sex-linked recessive disorder, which means that the gene responsible for this disorder is located on the X chromosome. In this case, the man with muscular dystrophy has the genotype , where represents the X chromosome carrying the gene for muscular dystrophy and represents the Y chromosome.Since the mother does not have the disease, she must have at least one normal X chromosome. However, since half of their daughters and half of their sons develop the disease, the mother must be a carrier of the gene for muscular dystrophy. Therefore, her genotype is , where represents the normal X chromosome.