Ans – Gregor Mendel a little known Central
European monk, was only whose ideas had been Published in 1866 but largely
went unrecognized until 1900 Which was long after his death.
His ideas
published Experiment in plant hybridization in pro of the natural society
(1866) Brunn. However for 34 years, his paper remained unknown, here three main
reasons –
1.
Those days Biologists were much
attracted towards Darwin's theory of evolution, and concentrated on the study of
life. Histories of various plants animals
2.
Scientists never imagined the
mathematics had any Connections with biology and so mendel’s statistical
approach was beyond their comprehension.
3.
Later some time mendel's work
was rediscovered simultaneously in 1900 by Devries (Holland), Correns (Germany)
and Tschermak (Austria). Since they were working on experimental breeding the
significance of their discovery become apparent at once to them.
Mendel considered that a single gene is
responsible for the traits, it is now known that several genes are involves in
the production of same traits although a single gene substitution can influence
the basic biochemical reactions and thus responsible for alternative end
products, for a particular traits there may be two or more than two gene.
Mendel law of dominance as a fundamental
inherent properly of the allele is no longer tenable to all cases mendel
studied character were in each of even pairs there were only two alternative
pairs there forms of each character, means only two allele were present in each
character but later work showed for a character these can be several
phenotypes.
Therefore the concept of alternative allelomorphs had to be modified
by concept of multiple allelism. Exception of this phenomenon were discovered
by Bateson Punnet (1905), due to linkage and crossing over.
No comments:
Post a Comment