Physiological and Biochemical Evidences of Evolution

Biology | Zoology Notes
Physiological and Biochemical Evidences of Evolution 
Class : 11

(i) Similarity in chemical composition 

In all the living forms four major elements like C, H, O, N form organic compounds. In all the living organisms C, H, O combine to form carbohydrates and fats and with N to form proteins. The protoplasm in all living organism have the same composition. The basic unit of life is cell. Therefore, from above it can be concluded that living organisms might have evolved from a common ancestor.

(ii) Precipitation test (Serological Test) 

The precipitations tests are used to determine and confirm the natural relationship due to the similarity of blood proteins. The degree of similarity between plasma proteins of various animals can be tested by the antigen-antibody technique. When the blood of man is mixed with the blood of monkey cat and dog, it gives high precipitation and when it is mixed with blood of orangutan, it gives less precipitation. When the blood of dog and cat is mixed together, it gives less precipitation. It proves that the cat and dog are closely related than the man and the man is closely related with the orangutan than cat and dog. 

This Content is Moved to our New site => http://www.merospark.com/hseb-notes/physiological-and-biochemical-evidences-of-evolution/

Read This Also:

• Grass land Ecosystem - Community, Succession and its Process in Hydrosere
• Reproduction in Bacteria | Kingdom Monera Biology Class 11
• Economic Importance of Bacteria | Kingdom Monera - Biology Class 11
• Cyanobacteria - General Characters, Reproduction and Description of Nostoc

Don't forget to IKE, SHARE and COMMENT. Please join with us on Facebook and Google+ for daily Notes or Subscribe for our Email Updates.