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Classical Definition of Gene |
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Classical definition of gene
The definition of gene is an operational one and had different meaning according to different viewpoints. Classically, gene as assumed to be a genetic unit by the following three criteria:
(i) A gene is a unit of physiological function that occupies a definite locus in the chromosome and is responsible for a specific phenotypic character, e.g., vestigial or long wings and white or yellow eyes in Drosophila;
(ii) A gene is a unit of transmission or segregation, because it can be segregated and exchanged at meiosis by way of crossing over.
(iii) A gene is a unit of mutation, because by a spontaneous or induced change it can give rise to different phenotypic expression.
These classical definitions of genes have been revised thoroughly due to recent discoveries in the field of molecular genetics.
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