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(A) $1$. Francois Jacob and Jacques Monod proposed the $Lac\,operon$ model in $1961$ to explain gene regulation in $E. coli$.$2$. Alec Jeffreys is kno

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Francois Jacob and Jacques Monod - $Lac\,operon$

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(A) $1$. Francois Jacob and Jacques Monod proposed the $Lac\,operon$ model in $1961$ to explain gene regulation in $E. coli$.$2$. Alec Jeffreys is known for developing $DNA$ fingerprinting,not for $Streptococcus\,pneumoniae$ (which was studied by Frederick Griffith).$3$. Matthew Meselson and $F$. Stahl provided experimental evidence for the semi-conservative replication of $DNA$ in $E. coli$,not $Pisum\,sativum$ (which was studied by Gregor Mendel).$4$. Alfred Hershey and Martha Chase conducted experiments with bacteriophages to prove that $DNA$ is the genetic material,not $TMV$ (Tobacco Mosaic Virus).

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