1. Duchenne muscular dystrophy (DMD) is caused by a relatively rare X-linked recessive allele. It causes...

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Biology

1. Duchenne muscular dystrophy (DMD) is caused by a relativelyrare X-linked recessive allele. It causes progressive muscularwasting, and usually leads to death before age 20. What is theprobability that the first son of a woman (who does not have thedisease but whose father is affected) will be affected?
2. Hemophilia in humans is inherited as an X linked recessivetrait. A woman whose father is hemophiliac marries a man withnormal clotting ability. What is the probability that her firstchild will have hemophilia? Assume that the woman's mother ishomozygous dominant.
3.In the ABO blood system in human beings, alleles A and B arecodominant and both are dominant to the O allele.Â Â In apaternity dispute, type AB women claimed that one of four men wasthe father of her type A child.Â Â What blood types couldthe father of the child be on the basis of the evidence given?

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Ans x linked recessive traits affect males more than females Because males have XY chromosomes and the X would carry thedefective gene In females XX are the chromosomes so the other Xchromosome suppresses the effects of defective X chromosome Here since the father of the woman had the disease his genotypewould be XY Now the woman would inherit one normal X chromosomefrom mother and one affected X See Answer

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