Ascientist wishes to compare the growth rates of corn plants when they are treated with different brands of fertilizer. the brands were labeled x, z, q, and p. the corn plants were grown in a greenhouse with the same amount of water and light. she measured the plants weekly for four months. the control group for this experiment is

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.