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There are several examples where environment influences gene expression.. For example, the freguency of an albino being born is 1 in 20,000, but in Hopi village for example, the frequency is 1 in 200. This is because they favour the trait by having consanguinous marriages often and hence the frequency increases. In another example, two flowers may have the same genetic make-up, but one may be blue and one maybe pink due to the difference in pH they can tolerate. The blue flower maybe blue due to low pH and the pink flower maybe pink due to high pH. The most common example however is when two monozygous twins (twins having the same genetic make up and also the same features) live in different environments, there will be remarkable difference in the two and you can tell just by looking at them. Thus, it is now only genes that decide how we look and act but also the environment that plays an equally important role in determining gene expression. Hope ur clear about it now.. cheers!

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16y ago

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