J. a. moore investigated how spotting patterns were inherited in leopard frogs (moore, 1943). there are two phenotypes. the pipiens phenotype had the normal spots that give the leopard frogs their name, whereas the burnsi phenotype has no spots on its back. moore carried out the following experimental crosses, producing the progeny indicated parent phenotypes offspring phenotypes burnsi x burnsi 39 burnsi, 6 pipiens burnsi x pipiens 23 burnsi, 33 pipiens burnsi x pipiens 196 burnsi, 210 pipiens a) on the basis of these results, what is the most likely mode of inheritance for the burnsi phenotype (i. e. is it dominant or recessive)? b) give the most likely genotypes of the parent in each cross (define the symbols you decide to use for each allele) c) use a chi-square test to evaluate whether the observed number of progeny fit to the number expected from your proposed genotypes.

Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.