BIOLOGY A wild-type male Drosophila was exposed to a large dose of X-rays and was then mated to an unirradiated female, one of whose X chromosomes carried both a dominant mutation for the trait Bar eyes and several inversions. Many $F_1$ females from this mating were recovered who had the Bar, multiply inverted X chromosome from their mother, and an irradiated X chromosome from their fathers. (The inversions ensure that viable offspring of these $F_1$ females will not have recombinant X chromosomes.) After mating to normal males, most $F_1$ females produced Bar and wild-type sons in equal proportions. There were three exceptional $F_1$ females, however. Female A produced as many sons as daughters, but half of the sons had Bar eyes, and the other half had white eyes. Female B produced half as many sons as daughters, and all of the sons had Bar eyes. Female C produced 75% as many sons as daughters. Of these sons, 2/3 had Bar eyes, and 1/3 had wild-type eyes. Explain the results obtained with each exceptional $F_1$ female.