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

Definition of counselling, Q. Definition of Counselling? Counselling ha...

Q. Definition of Counselling? Counselling has been defined as a process of helping/enabling a person/people solve certain interpersonal (not able to continue relationship), emo

What is an oligopeptide, What is an oligopeptide? How is it different from ...

What is an oligopeptide? How is it different from a polypeptide? Peptide is the molecule produced by the union of amino acids through the peptide bond. Oligopeptide is a peptid

What is asexual reproduction, What is Asexual Reproduction? Asexual re...

What is Asexual Reproduction? Asexual reproduction occurs in prokaryotes through the process of binary fission. Primitive eukaryotes and plants also reproduce by various t

Is all the cartilage in the body the same, Q. Is all the cartilage in the b...

Q. Is all the cartilage in the body the same? There are 3 types of cartilage in the human body: 1) hyaline cartilage; 2) elastic cartilage and 3) fibrocartilage. Hyaline cartil

Which part of body is the main site of gluconeogenesis, Gluconeogenesis syn...

Gluconeogenesis synthesizes glucose from noncarbohydrate precursors, involving pyruvate and lactate, citric acid cycle intermediates, the carbon skeletons of most glycerol and amin

Define about the paper chromatography, Define about the Paper Chromatograph...

Define about the Paper Chromatography? Paper chromatography is a very useful technique for separating mixtures of metal ions, anions, amino acids, sugars, dyes, drugs, etc. The

Megasporogenesis, Megasporogenesis One of the nucellar cells situ...

Megasporogenesis One of the nucellar cells situated subjacent to the epidermis differentiates into the primary archesporial cell. This cell is larger than the adjacent ce

Estrous cycle - reproduction, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Explain the course of events during spontaneous blinking, Explain about the...

Explain about the course of events during spontaneous blinking. Course of Events during Spontaneous Blinking: Given ate the course of events which take place in the

Define distribution of food products – public nutrition, Define Distributio...

Define Distribution of Food Products - Public Nutrition? We learnt earlier that we have buffer stocks of food grains in our country. These stocks do help to combat acute transi

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