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
what feactures of sedimentary rocks are unlikely to be found in metaphoric rocks

Explain the Urine Creatinine Test This test measures the amount of creatinine in urine. A measurement of the serum creatinine level is often used to evaluate kidney function. U

Define Systemic Physiology - physiology of growth and development There is a change in the blood count and rate of haemoglobin (Hb) production during the early days. Cardiovasc

Whats an easy way to work out force, mass and acceleration

Geometry and Astronomy: The need to portray an ideal world  of  perfect forms and proportions led  to the development of geometry by Pythagoras (583-500 B.C.) and Hippocrates o

difference between micro and macro nutrients

Explain the Complex Cells - Primary Visual Cortex They are sensitive to both orientation and movement. For example, a line or edge with a particular tilt might stimulate a comp

ht are the examples oof a solution and its characteristics?

Food as fuel for the body machine: Body requires food for internal as well as external activities and for growth. Another way of  looking at this is that the body requires ener

Determine about the Physico-chemical parameters The possible combination of various elements found in the earth's crust gives rise to a large number of minerals. Out of all the