Before trying to confuse yourself more I would suggest watching a few videos about sexual reproduction and genetics particularly mitosis and meiosis as well as maybe re-reading a few sections from your text book. The way you wrote your question makes it seem like you're slightly unfamiliar with some of these topics. Don't take any of that the wrong way, I just think it's in your best intrest to get the basics back down before you move on. Any more question you have just let me know! Happy Studying!
