Question

A. Environment can have a large influence on genes. Give an example (in humans) where environment impacts gene expression. You are welcome to use outside sources to address this question. Just make sure they are reliable (.gov, or .edu).

Answer 1

Ans) Genes expression can be influenced by environmental factors which may be internal or external.
For example : Temperature , which is an external factor.
Gender , which is internal factor.
External environmental factors like temperature , drugs and light helps to determine the genes which are used to turn off and on and hence , effect the development and function of organism.
Interaction between gene and environment takes place when 2 genotypes expresses variations in the environment which are different in their ways. When the difference in the phenotypes are continuous it shows the relation between the environment as well as gene. The variations in the environment may be either chemical , biological or physical. It is also useful for better understanding of variable disease.
For example : Exposure of sunlight has greater impact of risk of skin cancer in fairer humans as comapared to darker ones.

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