Response of Chickens with Different Hemoglobin Genotypes to Phenylhydrazine-induced Anemia

Abstract

NUMEROUS experiments have been conducted to establish the theory of gene control through gene induction and repression in bacteria (Jacob and Monod, 1959; Monod and Cohen-Bazire, 1953). Using a model for control of gene activity proposed by Jacob and Monad (1959), genes can be classified as structural, operator, or regulator. The structural genes code for a specific messenger RNA (MRNA) which acts as a template for synthesis of a specific protein. The operator genes control the initiation of the MRNA transcription from the structural genes. The function of the regulator gene is to synthesize a repressor substance, which controls the functioning of the operator gene. The regulator genes are in turn controlled by chemical substances from the external or internal environment of the cell. This system then provides for some control of gene activity by the environment of the organism. The effects of control systems of this nature have been…