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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.
Pelagic Zone - Organisation of the Marine Ecosystem The waters contained in the sea basin, constitute the pelagic zone which is divided into The neritic zone situ
Q. How different is the simple squamous epithelium from the stratified squamous epithelium? Where can these epithelia are found in the human body? The simple squamous epitheliu
DIFFERENCES BETWEEN PROKARYOTIC & EUKARYOTIC CELLS S . N o . CHA R AC T ERS P R O K AR Y O T I C CELL
T AXONOMIC EVIDENCES - Taxonomy is the classification of organism. The gradual development in the complexity of organisms with specialized characters from simpler organisms
Explain the Uses of ISO in Seafood products Seafood products The most significant application in this category is the use of ISP in fish sausage and surimi based restructu
What is deplasmolysis of plant cells? The plant cell when placed under hypertonic medium loses a huge amount of water and its cell membrane detaches from the cell wall. In that
Common Features of Eye and Limb Development A comparison of the embryonic development of the very much different organs, the eyes and the limb, points to various interesting
Determine the Light-Near Dissociation Test The near response should be tested in a well lit room so that the object is clearly visible. The patient is given an accom
important of biology to man
C adm iu m Like lead and mercury, cadmium is also non-essential biologically. The industrial use of cadmium in plastic production, electroplating and manufacture of alloys a
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