Inheritance160-page18 - The pigmentation gene is activated...

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Inheritance Patterns - 18 The Influence of the Environment on Gene Expression Conditions of the environment can often affect the expression of a gene. Or stated differently, the environmental conditions can regulate whether or not a gene gets expressed. The classic study demonstrating the direct effect environment can have on genetic expression was done with pigmentation gene of Siamese cats and Himalayan cats and rabbits.
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Unformatted text preview: The pigmentation gene is activated when the temperature falls below a certain point. Typically, the extremities are pigmented while the body core remains unpigmented or cream colored. To demonstrate that the pattern was temperature controlled, the backs of rabbits were shaved and ice packs placed on the shaved portion. When new fur grew, it was pigmented....
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