SO HARD! HELP PELASE! Assume a cross is made between fruit flies with the following genotypes: rrBB and Rrbb. Create the Punnett square for the F1 generation. Then provide the phenotypic ratio. (red eyes is dominant to white eyes, long body is dominant to short body)

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.