A/An ________ has been used to estimate that HIV-1 M first spread to humans in the 1930s.
A)parsimony analysis
B)epidemiological study
C)outgroup comparison
D)molecular clock

Question

Quizplus · Accepted Answer

A molecular clock is a tool that uses the rate of genetic mutations to estimate the time when two or more species diverged from a common ancestor. By analyzing the genetic differences between HIV-1 M and its closest simian immunodeficiency virus (SIV) relatives in primates, researchers were able to use a molecular clock to estimate that the cross-species transmission of the virus to humans occurred around the 1930s.

A/An ________ Has Been Used to Estimate That HIV-1 M