Since Duchenne muscular dystrophy is X-linked recessive, it requires all of the X chromosomes in a human to take effect. This is what makes it recessive.
Since females have two X chromosomes, both of their X chromosomes must have the allele for Duchenne muscular dystrophy in order to be an active disease.
However, since males only have one X chromosome, they only need to have the allele for Duchenne muscular dystrophy on that single chromosome in order to be an active disease.
It is much more likely to get one affected X chromosome than it is to get two affected X chromosomes, therefore this disease is almost always restricted to males.
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C as far as I know. Hope this helps!
Answer:
Option A
Explanation:
Autosomal dominant means that even a single affected allele in genotype of offspring can cause the disease.That means one carrier parent is sufficient to pass on the autosomal dominant disease to its next generation.
Given –
Woman is taster and father is nontatster. They mate and produce a nontaster daughter.
Hence, the genotype of the parents would be
Mother – XX’
Father – Y’X
Here allele “X” represents the non taster allele while the allele “ X’ and Y’ ” represents the taster allele
Cross between XX’ and Y’X
XY’, XX, X’Y’, XX’
Thus, the parents will have a taster boy
