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The most convincing evidence of descent from a common ancestor comes from the similarities in the biochemical composition and physiological activities of organisms.
1) Enzymes and hormones: in the same manner similar or identical enzymes and hormones, are found in large number of animal groups. For example, trypsin-the protein splitting enzyme, is found in animals from Protozoa to mammals and amylase from sponges to man.
2) Chromosomes: the essential component of nucleus in every living cell is the chromosome. The chemical composition of DNA is basically the same in all living beings except for differences in the sequence of nitrogenous bases.
Genetic code: it is surpising to note that the same genetic code having triplet code is found from viruses to man.
almost all the living organisms exhibit similar biochemistry.e.g.
- the genome i.e.DNA and RNA are chemically closely similar in their composition.
- the process of protein synthesis is also same in these organisms.
3. all of these organisms store energy in the form of ATP.
all these factors of biochemistry provide evidence for evolution.
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