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

Describe the term epinephrine, Describe the term Epinephrine? Epinephri...

Describe the term Epinephrine? Epinephrine is administered IV in increments of 1 mg diluted in 10 mls of normal saline (1:10,000). It can be given through the endotracheal tube

Explain the role of bones in human biology, Explain the role of Bones in hu...

Explain the role of Bones in human biology? Bone is covered by a tough outer membrane called the periosteum. The periosteum contains systems of capillaries that supply the bone

Explain the double and simple closed circulation, What is the difference am...

What is the difference among double closed circulation and simple closed circulation? Double closed circulation, or closed circulation, is that in which the blood circulates by

Explain about insulin concentrations, Insulin Concentrations The doctor...

Insulin Concentrations The doctor always prescribes insulin dosage in units. Thus all types of insulin (crystalline, NPH, Lente, and so forth) is available in 10-ml vials that

What is soil fertility evaluation, Soil fertility evaluation  In order ...

Soil fertility evaluation  In order to maintain soil fertility, nutrients removed from the soil by crops must be restored by the application of manures and fertilizers.  The se

Transmission electron microscopy, Transmission Electron Microscopy The so...

Transmission Electron Microscopy The source of illumination in a TEM is a tungsten filament that emits electrons. A vacuum is created to prevent the collision of electrons with a

ANIMAL TRANSPORT SYSTEM, WWHAT ARE THE ORGANS THAT ARE INVOLVDED IN THE TRA...

WWHAT ARE THE ORGANS THAT ARE INVOLVDED IN THE TRANSPORTTATION SYSTEM OF ANIMALS

Style of stigma interaction, Style of Stigma Interaction The style has...

Style of Stigma Interaction The style has been distinguished into two types: In open styles a stylar canal is present which is lined with a well-developed glandul

Name the corrosion resistant metals, Name the corrosion resistant metals ...

Name the corrosion resistant metals Most of the corrosion resistant metals or alloys used for implants have a layer of oxides on their surface. The thin (approximately 5 nm) la

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