20.The first diagram below shows an original sequence of DNA. The second diagram shows a mutation that occurred when the DNA was copied. Name and describe the kind of mutation that occurred.

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