Very Important Points of NCERT : 1. Genetic map discovere | Gaurav Gupta sir

Very Important Points of NCERT :

1. Genetic map discovered by Alfred Sturtevent.
2. Henking trace a specific nuclear structure (X-body) all through spermatogenesis in a few insects (1891).
3. Down’s syndrome was first described by Langdon Down (1866)
4. DNA (Nuclein) was first identified by Friedrich Meischer (1869).
5. X-ray diffraction data produced by Wilkins & Franklin.
6. Transforming principle was given by Griffith (1928).
7. Biochemical characterisation of transforming principle was given by
Avery, MacLeod & Mc Carty.
8. Unequivoal proof that DNA is the genetic material came from the
experiements of Hershey & Chase (1952).
9. Replication scheme was given by Watson & Crick.
10. Central dogma of biology was given by Crick.
11. The experimental proof that DNA replicates semiconservatively was
given in prokaryotes by Meselson & Stahl (1958).
12. The experimental proof that DNA replicates semiconservatively was
given in eukaryotes by Taylor (1958).
13. George Gamow (a physicist) proposed that codon was triplet.
14. Har Gobind Khorana synthesizes RNA molecules with defined
combination of bases (homopolyers & copolymers).
15. Nirenberg in cell-free system for protein synthesis finally helped the
code to be deciphered.
16. Polynucleotide phosphorylase is called Severo Ochoa enzyme
17. Lac operon was given by Jacob & Monad.
18. Automated DNA sequencers worked on the principle of a method
developed by Frederick Sanger
19. Frederick Sanger developed the method for determination of amino
acid sequences in proteins.
20. DNA fingerprinting technique was developed by Alec Jeffreys.
21. Spontaneous generation theory was dismissed by Louis Pasteur.
22. Life comes from pre-existing life it is told by Louis Pasteur.
23. Oparin & Haldane proposed that the first form of life could have come from pre-existing non-living organic molecules.