Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.
how can you find genes that are cotranscribed on a single mRNA?
Operon model: it had been given by jacob and Monod. this can be only applicable in prokaryotes as in bacteria , and in some lower eukaryotes. it's a unit of gene regulation which incorporates regulatory unit, promoter, operator, structural genes. during this kind of arrangement single promote is required to begin transcription of all structural genes. Single promoter control cluster of genes.
Operon is of two type: (a) lac operon ( inducible operon) (b) Tryptophan operon ( repressible operon)
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