And please give me EASY examples please like you see in everyday life.

We don't do homework and based on your attitude, language, disrespect for the rules I think you should figure this out for yourself. https://www.askmehelpdesk.com/math-sciences/could-anyone-help-me-categorize-following-terms-586706.html#post2844655

The expert in that category made it pretty clear to you - and you're biting the very hands that you are asking to feed you.

Here's what you posted: "...well, I just researched this crappy asz site and tried it. and who cares if someone will see the answers i need i am not a greedy bitxh anyway not like some people who answers question as selfish as themselves. and i did not go to this aszh0le website to learn something from your "STUPID" homily."

Alleles are just variations in genes. A good example is the gene for human eye colour. We all have one but some people have a version that gives them blue eyes, others have versions that make the eyes brown, hazel, green, grey or even mauve.