Objections to Darwinism

Objections to Darwinism

While the ideas of Darwin, related to reproductive capability,
prevalence of variations, concept of struggle and survival of suitable forms
are all commonly accepted, there are certain drawbacks in his original theory.

1. Darwin could not explain, the origin and cause for variations while insisting
their importance in progressive evolution.

2. He overemphasized the importance of the ‘fittest’ organisms. During later
periods it has been suggested that ‘fit’ and fitter forms can also exist along
with the fittest.

3. As the principle of inheritance as explained in the later years were not
available during Darwin’s time. Hence he believed in the theory of
‘pangenesis’. According to this concept from every organ in the body very
minute such replicate structures will orginate. Later they are transferred to
the gonads for transmission to future generations.

4. ‘Over-specialization’ as in Irish deer and its consequent harmful effect on
animals had not been accounted for by Darwin.

Neo-Darwinism

A modified form of Darwinism is known as neo-Darwinism. It was
developed due to acceptance of Darwinism and provision of several
evidences in support of Natural Selection concept. The early
neo-Darwinians were T.H. Huxley of England, Asa Gray of United States
and E.Haeckel of Germany.

The neo-Darwinians differentiated the germplasm from somatoplasm
and proposed the ‘germplasm concept’. They also belived that characters
are due to certain factors called the determinants that control the
development. The neo-Darwinism concept was incomplete and erroneous.
It lacked in an understanding of genetics as it is known in later periods.

Related Topics in Zoology:

Bio Zoology All Important Topics

  1. Livestock and Management
  2. Important cattle breeds and their characteristics
  3. Milch breeds (or) Dairy breeds
  4. Dual purpose breeds & Draught breeds
  5. Exotic breeds of cattle
  6. Common diseases and control in Cattle – Contagious diseases
  7. Non-contagious diseases – Cattle
  8. Techniques adopted in cattle breeding
  9. Poultry Breeds
  10. Farming methods
  11. Poultry byproducts
  12. Fish Pond
  13. Edible Fishes Of Tamilnadu
  14. Medical Lab Techniques – Stethoscope
  15. Sphygmomanometer
  16. Haemocytometer
  17. Urine Sugar analysis
  18. ECG Electrocardiogram
  19. Computed Tomography CT
  20. Endoscopy (Laproscopy) techniques , Artificial Pacemaker
  21. Autoanalyser

Unit 7. THEORIES OF EVOLUTION Topic List Zoology

  1. Theories Of Evolution Introduction
  2. Lamarck Laws
  3. Neo Lamarckism
  4. Darwinism
  5. Theory of Natural Selection
  6. Objections to Darwinism
  7. Modern concept of Natural Selection

Comments

Post a Comment

Popular posts from this blog

Root Canal Treatment

Image
Root Canal Treatment Root Canal Treatment is a modern dental procedure to save a tooth in which the pulp (the living tissue within a tooth) has died or become untreatably diseased, usually as a result of extensive dental caries. Steps involved in Root Canal Treatment (1) A hole is drilled into the crown to remove all material from the pulp chamber. The root canals are then cleaned with fine-tipped instruments. The procedure is usually monitored by X-rays. (2) The cavity is washed out, and antibiotic paste and a temporary filling are packed into it. Some days later, the filling is removed and the canals are checked for sterlity. (3) When no infection can be detected, the cavity is filled with a sealing paste and/or tapering solid “point” made of gutta – percha resin mixed with zinc and bismuth oxides. The mouth of cavity is then sealed with cement. Related Topics in Zoology: Bio Zoology All Important Topics Human Physiology Introduction Nutrition Carbohydrates Poly hydroxyaldehydes...
Read more

Eye Infections and Eye Care

Image
Eye Infections and Eye Care Eye Infections 1. Stye A stye is an acute infection of the glands located at the eyelid margin. There is swelling, pain, itching and redness in a small area at the lid margin. Treatment consists of using frequent warm compresses on the eye. (Eye Infections) 2. Conjunctivitis: Infection in the conjuctiva is called conjunctivitis. Due to the infection the invisible blood vessels within the conjunctiva become engorged. Inflammation of the conjuctiva causes redness, discomfort and a discharge from the affected eye. The most common causes for conjunctivitis are infections (in children) and allergy (in adults). (Eye Infections) 2a. Infective conjunctivitis : Most conjunctival infection are caused by bacteria (e.g staphylococci) and are spread by hand-to-eye contact or by viruses associated with a cold, sore throat, or illness such as measles, viral conjunctivitis sometimes occurs in epidemics, spreading rapidly through schools and other groups. (Eye Infections) 2b...
Read more

Botanical description of Hibiscus rosa sinensis

Image
Botanical description of Hibiscus rosa sinensis Hibiscus rosa sinensis Botanical description of Hibiscus rosa sinensis Hibiscus rosa sinensis General Characters Habit Perennial shrub. Root Tap root system. Stem Aerial, erect, cylindrical, woody and branched. Leaf Simple, Alternate, petiolate, stipulate, serrate, glabrous, apex acuminate with multicostate reticulate venation. Inflorescence Solitary cyme and axillary. Flower Pedicel jointed, bracteate, bracteolate, bisexual, large, showy, pentamerous, dichlamydeous, actinomorphic, complete and hypogynous and mucilage is present in floral parts. Epicalyx 5 to 8 bracteoles outer to the calyx. They are green and free. Calyx Sepals 5, green, gamosepalous showing valvate aestivation and odd sepal is posterior in position. Corolla Petals 5, variously coloured, polypetalous but fused at the base and showing twisted aestivation. Androecium Numerous stamens, monadelphous, filaments are fused to form a staminal tube around the style. Staminal tube...
Read more