Explain theory of evolution through natural selection, Biology

Assignment Help:

Explain Theory of Evolution through Natural Selection

The third theory of evolution through natural selection was put forward jointly by Darwin, and Wallace in 1859. This theory supported the idea of both Lamarck and Cuvier. Thus, this theory gave the greatest support to systematic zoology. By the 19th century Darwin's ideas had been widely accepted. The Naturalists started searching for missing links between seemingly unconnected taxa and finally reconstructed the "primitive ancestors".'Phylogenetic trees were proposed by  Hackel which also stimulated several empirical workers and large number of species were discovered and described.

Then came the modern taxonomy and with its development workers realised that the Linnean species based on one or two specimens are not as perfect as those which are based .on population studies. After these studies Mayer considered species as groups of interbreeding natural population. This idea of population taxonomy was useful in establishing "polytypic concept". New terms like New Systematic and biosystematics were added. The faxonomists then realised the importance of other characters in sound classification. Then the scientists started searching for characters from field studies and various characteristics of living animals, namely behaviour, ecology, genetics, zoogeography, physiology, biochemistry. Thus, taxonomy got a new name 'biological taxonomy' in its true sense. The taxonomists came to know their dependence on new characteristics in solvings species complexes and by about 1955 a state of 'taxonomic explosion' was reached.

Thus, present day taxonomic works include all available differences and similarities, phylogenetic adaptations, embryological patterns, biochemical variations, genetical similarity and behavioural characteristics etc. The general concordance of the data from all such diverse source mutually supports the basic validity of the scheme of classification.


Related Discussions:- Explain theory of evolution through natural selection

Gorgonids, Gorgonids yield chemicals like prostaglandins, medically useful ...

Gorgonids yield chemicals like prostaglandins, medically useful for birth control, prevention of peptic ulcers, treatment of asthma, regulation of blood pressure, etc. Sponges are

Class of subphylum uniramia - pauropoda, Class of Subphylum Uniramia - Paur...

Class of Subphylum Uniramia - Pauropoda A small group of uniramians, there are 500 species of Pauropoda explained so far. The minute organisms computing about 1.5 mm in length

Carbohydrate required for underweight - nutritional care, Explain the Carbo...

Explain the Carbohydrate required for underweight - Nutritional Care? Liberal amounts of easy to digest carbohydrates should be included in the diet. The intake of dietary fibr

Explain adverse effects of valacyclovir, Adverse Effects of Valacyclovir  ...

Adverse Effects of Valacyclovir  Valacyclovir is generally well tolerated; adverse effects are similar to those with acyclovir. GI disturbance, headache, rash, CNS effects such

What is endocytosis, Which of the following is true for endocytosis? A....

Which of the following is true for endocytosis? A. During endocytosis of GLUT4 transporters in fat cells, there is removal of GLUT4 transporters from plasma membranes. B. Du

Which are the extra abundant ribosomes in secretory cells, Q Which are the ...

Q Which are the extra abundant ribosomes in secretory cells - the free cytoplasmic ribosomes or those associated with the rough endoplasmic reticulum? Free cytoplasmic ribosome

What is the difference between facilitated and diffusion, Q. What is the di...

Q. What is the difference between facilitated and simple diffusion? Facilitated by which kind of molecule does the term "facilitated" mean? Simple diffusion is the direct passa

Man-made disasters- nuclear disasters, Among all the environmental disaster...

Among all the environmental disasters that might be caused by humans, nuclear disasters have the greatest potential of causing severe damage to life property. The released as a con

Nutrition, Nutrition, Feeding, Digestion All organisms require a fairl...

Nutrition, Feeding, Digestion All organisms require a fairly steady supply of nutrient materials from the environment to obtain energy in order to stay alive. The animals are

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd