The existence of mitochondria within cells is an example of co-evolution as the mitochondria has a different dna sequence than that of the nucleus in the host cell.

a. eukaryote
b. fungus
c. protist

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

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.

In a population that is in hardy-weinberg equilibrium, there are two possible alleles for a certain gene, a and a. if the frequency of allele a is 0.4, what fraction of the population is heterozygous? a. 0.40 b. 0.60 c. 0.16 d. 0.48