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THE lac OPERON
Control, genomes and environment
F215 Unit 5: Cellular control and variation
The bacterium E. coli requires two enzymes, lactose permease (to transport lactose into the bacterial cell) and -galactosidase (to break down
lactose into galactose and glucose), in order to respire the carbohydrate lactose. Interestingly, when E.…

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MEIOSIS AND VARIATION EPISTASIS
prophase I ­ chromosomes shorten and fatten (supercoil) and come together in homologous pairs to form a bivalent, and the Epistasis is different from codominance: this is where one gene masks or suppresses the expression of another. With recessive
chromatids wrap around each other at points…

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