Nada, Some things that come in pairs for the left and right side of our body (such as jeans, socks, shorts, shoes, spectacles) and are always written in the plural form. Therefore, they are paired with a plural verb (The jeans are made in Italy.) If you are referring to a specific pair, then you have to write: "This pair of jeans is made in Italy." because you are now referring to one thing.

Jeans are always plural. In English, they always come in pairs "A pair of jeans" "Two pairs of jeans" So... jeans are made in Italy

The word for the piece of clothing, "jeans", is always plural. You never have one "jean", but "one pair of jeans" or simply "jeans". The same rule applies to "pants", trousers", and "shorts", though you can use "pant" in the singular form as an adjective (i.e. "pant suit").

This word is pronounced the same as the biological term "genes", which can be both singular ("gene") and plural ("genes").