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no because genes are something totally different
no 'cause genes are your bodies make up and jeans are a long pant clothing articles.
The phrase is actually, "it's in your GENES," meaning it is genetic. Some people like to make a joke of it by using a play on words with "jeans" instead of "genes."
You wear jeans, because you are aware of genes.
The homophone for jeans is genes.
freeze, frieze jeans, genes