If a cell were unable to produce histone proteins, which of the following would be a likely effect?

a) spindle fibers would not form during prophase.
b) dna polymerase i would not function properly.
c) expression of other genes would compensate for the lack of histones.
d) the cell's dna couldn't be packed into its nucleus.

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.