Theory of germplasm, Biology

THEORY OF GERMPLASM -

  • August Weismann (1834-1914) criticized the inheritance of acquired characters by putting forward the theory of continuity of germplasm.
  • According to this theory, the characters of influencing the germ cells are only inherited.
  • There is a continuity of germplasm (protoplasm of germ cells) is not transmitted to the next generation hence it does not carry characters to next generation.
  • Weismann disproved the inheritance of acquired characters by cutting off the tails of rats for about 20 generations and allowed them to breed but tailless rats were never born.
  • Weismann stated that organisms comprises of two types of protoplasm - the germplasm, the protoplasm present in germ cells only and which is passed on to the offsprings, and the somatoplasm, the protoplasm forming remain of the body part and plays no role in heredity.
  • Darlington commented - "Lamarck's theory is an evergreen superstition".

EXAMPLES AGAINST THE THEORY -

  • Muscles of arms and shoulder in blacksmiths.
  • Circumcison of foreskin of penis in jews and muslims.
  • Piercing of ear -lobe in Indian women.
  • Shaving of beard in man.
  • The wrestler's powerful muscles are not transmitted to the offsprings.
  • Chinese women used to wear iron shoes in order to have small feet, but their children at the time of birth always normal feet.
Posted Date: 10/9/2012 1:02:23 AM | Location : United States







Related Discussions:- Theory of germplasm, Assignment Help, Ask Question on Theory of germplasm, Get Answer, Expert's Help, Theory of germplasm Discussions

Write discussion on Theory of germplasm
Your posts are moderated
Related Questions
Which are the living beings that carry out photosynthesis? Which is the cell organelle responsible for the absorption of light for the photosynthesis process in plants and algae?

what is meant by "pelagic"?

Explain about the Ascomycota - Fungi? Ascomycota - Ascomycetes or sac-like fungi have septate mycelium. These are called so because sexual reproduction involves the formation o

Ethylene - Apical Dominance Ethylene also plays a role in the inhibition of lateral bud growth. It is present in those tissues like shoot apex where auxins are also present. I

Large Quantity of energy is released during an earthquake with a combination of radiated elastic strain seismic waves frictional, heating of the fault surface and cracking of the r

Glucose-1-phosphate to Glycogen The conversion  of glucose-1-phosphate  to glycogen  is  through UDPG and glycogen synthase. We shall learn about  this later in section under g

Why is the development of bipedalism considered to be a major advancement in human evolution?

Explain Negative Staining Technique? Here, a stain has a negatively charged chromophore that is repelled by the negative bacterial surface. It results in indirect staining of m

Q. How does the intensity of facilitated diffusion differ in relation to the concentration of the moved substance? What is limiting factor? Like simple diffusion facilitated di

Define the Blood coagulation - Function of Vitamin K? The primary function of vitamin K in the body is in the maintenance of normal blood coagulation. The vitamin K-dependent c