Question

is there enough evidence to defend the claim that x - rays caused all the lethal mutations in the offspring of flies exposed to x - rays?
a. yes, because the flies were not exposed to any other source of radiation
b. yes, because the group of flies exposed to x - rays had more lethal mating pairs in their offspring
c. no, because the offspring of flies not exposed to x - rays also had a lethal mating pair
d. no, because the flies exposed to x - rays did not die, meaning they did not have lethal mutations

Explanation:

To claim that X - rays caused all lethal mutations in the offspring of flies exposed to X - rays, there should be no lethal mutations in non - exposed flies. Since the offspring of non - exposed flies also had a lethal mating pair, it means other factors could be causing lethal mutations. So, there is not enough evidence to support the claim.

Answer:

C. No, because the offspring of flies not exposed to X - rays also had a lethal mating pair