In a certain plant, yellow leaves are dominant () and red leaves are recessive (). A plant with genotype Yy and a plant with YY are crossed, if they have four offspring, how many would you predict would have red leaves? (Hint: Draw a Punnett square to help you determine the answer.) O AO OB. 3 O c. 2 2. O D. 1 apx ans is 0

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.