Two heterozygous purple-flowering pea plants are crossed. if purple is dominant over white, what are the expected phenotypic results?

a) 100% purple
b) 75%, purple, 25% white
c) 50%purple, 50% white
d) 25% purple, 75%white

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.