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

The smooth er and rough er are similar functions, What functions of the smo...

What functions of the smooth ER and rough ER are similar?

Do all molecules of dna have the same amounts, Q. Do all molecules of DNA h...

Q. Do all molecules of DNA have the same amounts of nitrogenous bases? Number and sequence of nitrogenous bases in DNA molecule are key elements in variations which are found i

Nucellus - ovule, Nucellus - Ovule Enclosed within the integuments li...

Nucellus - Ovule Enclosed within the integuments lies a homogenous mass of tissue which is termed as the nucellus. This is the tissue in which the female gametophyte differen

Explain some limitations of most probable number, Explain some Limitations ...

Explain some Limitations of Most Probable Number? 1. Large quantity of glassware is required. 2. Colony morphology cannot be determined. 3. It lacks precision.

Name the groups into which flowering plants are divided, What are the two m...

What are the two main groups into which flowering plants are divided? Angiosperm plants are separated into a) Monocotyledonous (monocots) and b) Dicotyledonous (dicots

Dietary guidelines fur hyperlipidemic patients, Q. Dietary Guidelines fur h...

Q. Dietary Guidelines fur hyperlipidemic patients? • Calories: to maintain ideal body weight. • Carbohydrates should constitute 55-65% of calories with emphasis on • polysacc

Gregor mendel, why green seeds reappeared in the f2 generation

why green seeds reappeared in the f2 generation

Define the wealth care delivery, Define the Wealth Care Delivery ? The ...

Define the Wealth Care Delivery ? The challenge that exists today in many countries is to reach the whole population with adequate health case services and to ensure their util

Cleft palate, Cleft Palate: Well you have now learnt about the cleft l...

Cleft Palate: Well you have now learnt about the cleft lip and now let us dicuss and understand what is cleft palate. Cleft palate (CP) is midline fissure of  the palate that

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