Recognize the non-mendelian mode of inheritance

Q. Recognize the non-Mendelian mode of inheritance for each of the follow:

A.) A woman from the family with normal cholesterol marries a man with no LDL receptors, and all their children have cholesterol levels twice the normal of the mother.

B.) In humans, skin colour follows a bell-shaped curve, with very few people having very dark or very fair skin; most people have a medium shade.

C.) Duchenne muscular dystrophy is almost always limited to boys, who inherit it from their non-affected mothers, who are heterozygous.

D.) Even though sickle-cell anemia is because of a single allele, it causes a lot of phenotypic changes in those affected.

E.) A white cow crossed with a red bull yields roan calves.

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