Displaying articles by tag: Zoology Notes

BS Media in Zoology
Sunday, 11 June 2017 08:29

DIVERGENT EVOLUTION

Adaptive Divergence Evolution has been described as the process of gradual modification in the plants or animals (living organisms) basically two patterns are distinguished in the process of evolution. The minor changes in the gene pool of a population from one generation to the next may not produce new populations.…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Divergent Evolution
  • Evolution
  • Adaptive Divergence
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BS Media in Zoology
Sunday, 11 June 2017 08:02

SPECIFICATION IN ORGANIC EVOLUTION

A species is an ecological unit. The species is a group of potentially interbreeding natural populations which share in a common gene pool. But species are reproductively isolated from other such groups. A species comprises of several populations. There are two distinct ways in which new species arise from the…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Specification in Organic Evolution
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BS Media in Zoology
Sunday, 11 June 2017 06:45

ISOLATION: ITS ROLE IN EVOLUTION

The division of a single population into two or more groups because of some barrier for interbreeding is called Isolation. There are a number of processes by which two related populations living in the same area, can remain distinct These have been called Isolating mechanisms by Dobzhansky. According to him,…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Role of Isolation in Evolution
  • Evolution
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BS Media in Zoology
Sunday, 11 June 2017 06:14

HARDY-WEINBERG LAW

Hardy Weinberg Law of Equilibrium:   The most fundamental idea in a population genetics was proposed by English-man G.H. Hardy and German W. Weinberg simultaneously in the year 1908. Later in 1929-30, the mathematical treatment of the distribution of gene and genotype frequencies in a population was developed principally by…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Hardy Weinberg Law
  • Evolution
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BS Media in Zoology
Sunday, 11 June 2017 05:49

GENETIC DRIFT

Genetic drift as one of the evolutionary force   The genetic architecture of small population changes irrespective of elective advantage or disadvantage. Analogously genes attain Hardy-Weinberg’s equilibrium in large populations only. The random changes in gene frequencies occurring by chance and not under the control of natural selection are called…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Genetic Drift
  • One of the Evolutionary Force
  • Genetics
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BS Media in Zoology
Saturday, 10 June 2017 18:26

PHYSIOLOGICAL EVIDENCES OF ORGANIC EVOLUTION

Study of the functional aspects of the organism is called physiology. The organs and organ systems are similar in the closely related animals. The functional aspect of closely related animals is also same. The physiological evidences are studied in three headings; They are   FUNDAMENTAL UNITY OF LIFE BIOCHEMICAL SIMILARITIES BETWEEN…

  • Zoology
  • Zoology Notes
  • Notes
  • Physiological Evidences of Organic Evolution
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BS Media in Zoology
Saturday, 10 June 2017 17:43

AMAZING BIOLOGY FACTS

AMAZING BIOLOGY FACTS   BRANCHES OF BIOLOGY FATHERS OF BIOLOGY (PIONEERS IN BIOLOGY) DISCOVERERS AND INVENTORS IN BIOLOGY LIST OF BIOLOGY SYMBOLS AND ABBREVIATIONS AND THEIR MEANING BIOLOGY TERMS: FIRST USERS AND COINERS EXOCRINE GLANDS FACTS OF ANIMAL WORLD IMPORTANT FORAMEN SMALLEST ANIMALS LARVAES OF ANIMALS LARGEST ANIMALS MOST POISONOUS…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Amazing Biology Facts
  • Biology Facts
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BS Media in Zoology
Saturday, 10 June 2017 13:28

PALAEONTOLOGICAL EVIDENCES OF ORGANIC EVOLUTION

1. FOSSILS   Study of the past lived organisms which are not now on the globe or fossils is called Paleontology. Normally hard parts like spicules, setae, chitinous exoskeleton, shells, spiny exoskeleton, scales, bones, feathers, teeth and hair of past lived organisms were preserved as fossils.     2. FOSSILISATION…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Palaeontological Evidences
  • Organic Evolution of Life
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BS Media in Zoology
Saturday, 10 June 2017 08:03

EMBRYOLOGICAL EVIDENCES FOR ORGANIC EVOLUTION

The Study of the developmental stages of an organism is called If we observe the embryos of different animals, there is a similarity. This similarity tells us that there is a relationship between the animals. The embryological evidences show support to organic evolution.   SEQUENCE OF DEVELOPMENTAL STAGES   All…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Embryology
  • Embryological Evidences for Organic Evolution
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BS Media in Zoology
Friday, 09 June 2017 20:01

ORGANIC EVOLUTION EVIDENCES

EVIDENCES OF ORGANIC EVOLUTION The theories which we have discussed are imaginary. There is no practical proof for them. The various animals which we are seeing today were gradually evolved from simple past lived organisms. It is not possible for anybody to observe a single change, because our life span…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Organic Evolution Evidences
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BS Media in Zoology
Friday, 09 June 2017 19:13

NEO DARWINISM

SYNTHETIC THEORY OF EVOLUTION   Darwin’s theory of natural selection was accepted. The strong supporters of Darwinism are Wallace, Huxley, Haeckel, and Weismann. In the light of recent researches the theory was modified. Several experimental evidences have gone in favor of Darwinism. Basing on ‘those facts and statically data a…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Neo Darwinism
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BS Media in Zoology
Friday, 09 June 2017 18:21

Mutation Theory

MUTATION THEORY BY HUGO DE VRIES   It was proposed by Dutch botanist, Hugo devries in 1901.hugode-vries-mutation He was one of the rediscovered of Mendelism. Devries gave importance to those variations, which are discarded by Darwin. Though Devries thought that he proposed mutation theory in against to Darwin, but it…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Mutation Theory
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BS Media in Zoology
Friday, 09 June 2017 13:53

DARWINISM - THEORY OF ARTIFICIAL SELECTION

Artificial Selection:   It is an additional factor. Here man (Animal Breeding and Plant breeding) acts as a source of selection. Man artificially selects two individuals having required qualities, breeds them and produces new variety. This method is applied in dairy, poultry, piggery etc.   The introduction of ‘Murrah cattle’…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Darwinism
  • Theory of Artificial Selection
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BS Media in Zoology
Friday, 09 June 2017 08:02

CRITICISM OF DARWINISM

Many objections were proposed by scientist to Darwinism. They are,   Natural selection does not explain the origin of variations (arrival of the fittest). It explains only the presence of variations (survival of the fittest). Why Darwin was unable to explain the origin of variations? Because he did not know…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Demerits of Darwin Theory
  • Criticism of Darwinism
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BS Media in Zoology
Friday, 09 June 2017 07:36

THEORY OF NATURAL SELECTION

It was proposed by Charles Darwin. He is an English naturalist. Darwin travelled on the ship H.M.S. Beagle for about five years from 1831 to 1835. He visited many islands of Atlantic and west Pacific oceans. Darwin was very much attracted by Finch Birds of Galapagos Island. He collected many fauna and flora from…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Theory of Natural Selection
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