In maize, a dominant allele a is necessary for seed color, as opposed to colorless (a). another gene has a recessive allele wx that results in waxy starch, as opposed to normal starch (wx). the two genes segregate independently. an aa wxwx plant is testcrossed. what are the phenotypes and relative frequencies of offspring?

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?