Phenotypes that have a range of variability (not discrete differences such as mendel's pea flower color), are typically a resuit of
a. polygenic inheritance
b. independent assortment
c. gene linkage

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition. b) one-fourth of the daughters of an affected man would have this condition. c) one-half of the daughters of an affected father and a carrier mother could have this condition. d) only if a woman is xxx could she have this condition.

Crossing over is a method of (blank)?

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