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
how pollination occurs in Salvia?

What are two specific organs that work together to preform a function??

Explain the Bright Field Microscopes? Figure illustrates the compound bright field microscope. This is the most commonly used microscope in biology and microbiology courses. It

Sterility in Angiosperms Sterility in angiosperms may arise due to several causes. Either the anther may not be formed, or anthers are formed but meiosis may be abnormal. A

Define the Physical and Chemical Factors That Affect the Pasteurization? There are a few other physical and chemical factors that affect the pasteurization method. These involv

Setting priorities for action: It is not enough for our actions to be coordinated with events in the outside world; they must reflect our internal needs. Pain can flood conscious

Q. How does synaptic transmission between neurons take place? The propagation of the action potential along the axon reaches the region immediately anterior to the presynaptic

Q. Requirements of various nutrients in constipation? The requirements of various nutrients are not altered in constipation. It is essentially a normal balanced diet (normal RD

MIDDLE LAMELLA It is thin, amorphous, intercellular matrix between 2 adjacent plant cell. The cells of plant tissue generally cemented together by an intercellular matrix

What are the subkingdoms into which the plant kingdom is divided? The kingdom Plantae is separated into two big subkingdoms: the bryophytes and the tracheophytes (pteridophytes