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
Define Information Required for Management of Emergencies? Management or intervention needs accurate information about the actual situation and includes many non-nutritional co

Explain the chemical properties of milk Autoclaving milk, wherein temperature of around 121 o C is achieved, causes browning. The brown colour is due to the heat effecting an i

Crown and bridge remover - Nash\Taylor temporary crown remover -morell remover -position the curved tip below the height of contour or at the margin of the crown -Apply seve

Define about Aliphatic alcohols - Non Glyceride Fractions? These are water-insoluble, with their content varying from 0.5-7% of the unsaponifiable matter. Rice bran oil contain

Q. Why iodine is vital for human beings? Iodine is a essential chemical element for the proper functioning of the thyroid since it is part of the hormones produced by this glan

Omnispective Classification This is the extension of the concept of natural classification put forward by Black Welder (1967). The approach seems quite realistic and pragmatic.

What are the major morphological differences between monocot plants and dicot plants? The main differentiation criteria among monocots and dicots are: number of cotyledons (see

Prevention of perinatal transmission  Zidovudine alone, started at 14-34 weeks of gestation and continued in the infant for the first 6 weeks of life, reduced HIV transmission

What is the group of the phylum Chordata that first colonized the terrestrial environment? From which habitat did they come? Amphibians, partially aquatic partially terrestrial

What is the karyotype found in Down syndrome? Down syndrome is the aneuploidy that is a numeric alteration of chromosomes within the cells compared to the normal number of chro