About Molecular Evolution
Molecular evolution is the process of change in the sequence composition genetic material in populations of organisms. The genetic material consists of DNA, RNA, and proteins across generations. The revolution in DNA technology has been a major advance because of the very nature of DNA allows it to be used as an evolutionary history document, comparisons in the DNA sequences of various genes between different organisms can tell us about the relationships of organisms that cannot be correctly inferred from morphology. One definite problem is that the DNA itself is a scattered and fragmentary document of history and we have to beware of the effects of changes in the genome that can bias our picture of organism evolution.