Biochemical evidence, Science

Biochemical Evidence:

As we had said earlier in section 13.2, Darwin had  recognized  that humans and the great apes shared many physical characteristics. This led him  to conclude, that humans and apes descended from a common stock. Darwin's conclusions were based on the study of fossils and the physical similarities  that he had observed. Now, a century later biochemical studies of  proteins and the genetic material-DNA  show how good his guess  was, Biochemical studies show us that, as evolution proceeds and the species get differentiated,  they accumulate changes in the structure of  their proteins and DNA. Longer the separation time, greater the changes. These changes are expressed in terms of  percent genetic distance which indicates  the proportional difference between the DNA of  the two species. Comparative studies of the proteins of  the African apes and humans showed that chimpanzees, gorillas and humans are closely related  to one another, while the Asian apes, i.e. the gibbon and orangutan were the more distant cousins of  this trio  .

 

1779_Biochemical Evidence.png

Once the Asian and African apes were considered to be closely related and it was thought that  the hominids developed from apes prior  to 15 million years ago. Biochemical evidence, however, indicates that the ape-human divergence may have been much closer to five million years and that  thc gorilla split off  first, leaving the chimpanzees and the human-like creatures to share a common ancestor briefly before separating. Ramapithecus fossil specimen found in Asia, Europe and Africa was at one time thought to be closely related  to the species of modem man. However, on the basis of biochemical evidence, it has now been  shown that  it cannot be considered a homonid, because it  lived before  the Asian apes diverged from hominids. Same is true for Sivapithecus indicus, a fine fossil specimen of which was discovered in  1980 from the foothills of  the western Himalayas in  Pakistan. 

Posted Date: 9/28/2012 3:55:18 AM | Location : United States







Related Discussions:- Biochemical evidence, Assignment Help, Ask Question on Biochemical evidence, Get Answer, Expert's Help, Biochemical evidence Discussions

Write discussion on Biochemical evidence
Your posts are moderated
Related Questions
I need to write a report of 3pages

Explain the Nuclei or Ganglia Deep within the cerebral hemispheres are groups of nerve cells called nuclei or ganglia which act as relay stations, where impulses are passed fro

Explain Internal Respiration What do you understand by the term 'internal respiration'? Well, the interchange of gases between the blood and cells of the body is internal respi

FIRST AID PROCEDURE FOR ELECTRIC SHOCK : Although the procedure described is usually followed, there are occasions when other matters have to be considered and therefore the proce

How big is the Earth? The Earth size : is neither the largest nor smallest planet in our solar system. It is the largest of the non-gaseous planets (Mercury, Venus, Mars, and

What time period can carbon-14 dates have? Carbon 14 has a half-life of 5,730 years, and thus it can be used to date very precisely a large majority of things, particularly woo

What are the heat sources in the earth?

How does the intercourse work?