Pseudohypertrophic muscular dystrophy is a human disorder that causes gradual deterioration of the muscles. Only boys are affected, and they are always born to phenotypically normal parents. Due to the severity of the disease, the boys die in their teens. Is this disorder likely to be caused by a dominant or recessive allele? Is its inheritance sex- linked or autosomal?
A) recessive, sex- linked B) dominant, autosomal C) dominant, sex- linked D) recessive, autosomal
A black guinea pig crossed with an albino guinea pig produced 12 black offspring. When the albino was crossed with a second black animal, 6 blacks and 6 albinos were obtained. What is the best explanation for this genetic situation?
A) Albino is recessive; black is recessive. B) Albino and black are codominant. C) Albino is recessive; black is dominant. D) Albino is dominant; black is incompletely dominant. E) None of the above applies.
Mendel crossed yellow- seeded and green- seeded pea plants and then allowed the offspring to self- pollinate to produce an F2 generation. The results were as follows: 6022 yellow and 2001 green 8023 total). The allele for green seeds has what relationship to the allele for yellow seeds?
A) incompletely dominant B) dominant C) semidominant D) recessive