Examples of environment and molecular-gene expression

Need to write 1500 words about the question given, would appreciateif you could help me on what i need to talk about becuase it istotally confusing. for environmental do i talk about medication such as steroids and also sunlight? and formolecular do i talk about enzyme? would be pleased if youcould giv some examples of environment and molecular examples and how andwhy they influance the expressionof gene.

Is this correct structure for essay.

Intro : brief discription of gene expression, what it is, what itsused for. then state what will talk about in the essay (Ive done this its about 150 words)

Main body : will talk about gene expression, who discovered it, andmore detail what it does and why an how . then will talkabout molecular and environmental examples that influanceexpression of gene/

(ive done 600 words on it so far including illustration, just stuckon the examples of enviromental and molecular intearaction thatinfluance expression of a gene)

Conclusion : sum up of the essay

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