gene expression | | Beadle and tatum hypothesis

State the Beadle and Tatum theory.

One gene-one enzyme hypothesis of Beadle and Tatum was experimentally proved on:

Assertion. One gene-one enzyme hypothesis of Beadle and Tatum is true in all cases. Reason. An enzyme always consists of more than one polypeptide chain

While working on Neurosprora crassa, Beadle and Tatum proved

Assertion: gene expression is a molecular mechanism by which a gene expresses a phenotype. Reason: Structural genes are controlled by control genes.

In regulation of gene expression in prokaryotes : A. Lactose acts as an the suppressor for gene expression B. Tryptophan acts as the inducer for gene expression C. Regulator gene is the one that produces the repressor molecule

Control of gene expression takes place at the level of