LIFE SCIENCE

Detailed explanation-1: -Genetics. One of the strongest evidences for common descent comes from gene sequences. Comparative sequence analysis examines the relationship between the DNA sequences of different species, producing several lines of evidence that confirm Darwin’s original hypothesis of common descent.

Detailed explanation-2: -Yet there were two fundamental gaps in his chain of evidence. First, Darwin had no knowledge of the mechanism of heredity. Second, he had no visible example of evolution at work in nature. It is a curious fact that both of these gaps could have been filled during Darwin’s lifetime.

Detailed explanation-3: -By examining the chemical make-up of different living things, we can see how closely they are related. One class of biochemical evidence of evolution, homologous molecules, is biochemicals that are very similar in structure and function in all organisms. An example of a homologous protein is cytochrome c.

Detailed explanation-4: -Which of the following is biochemical evidence that supports the theory of common descent? Use of the same DNA triplet code and the same 20 amino acids in the protein of all organisms. Which of the following is an example of a vestigial structure?