 So Mendel started making pee babies and before he did anything He established what he called true breeding lines of plants his true breeding plants for a certain characteristic all parents Parents no, maybe I'm a hum all offspring always look like the parents for the given trait forever doesn't matter how many times you Cross plants They always look the same so a true breeding line of let's say Yellow-seeded plants That means that in this line You take a seed. It's a yellow seed you plant it you grow a plant that makes yellow seeds You cross it with another plant that makes yellow seeds and you get yellow seeds forever every time you take Yellow-seeded plants from this line and cross them with each other. You always get yellow-seeded babies No variation What I can tell you is that these true breeding plants. I don't know that Mendel Well, I do know he didn't know this But we know that in order to have true breeding plants. You have to have you have to be homozygous for the trait That's the only way you can be true breeding This is super interesting and we'll see why that is but that's what he started with So we know that when he started doing his crosses. He had peas That always resulted in the same Babies everybody looked the same forever. They were true breeding Okay, so here's what he did He started out. He said, okay, I'm gonna have a parent Generation and he picked one of his traits and for example, I'm going to show you a picture in a second of a Purple flower we could use per we could use the flower gene. So he has a purple flowered plant and he crossed it with a white Flowered Plant it's one gene To alleles two possible alleles So he found a true breeding line of purple plants and a true breeding line of white plants flowered plants and then he crossed them and What he found is in the next generation which he called the F1 generation He found they were all purple flowered That was 100% 100% of The babies had purple flowers He was like, where'd the white flowers go? They disappeared But then he was like hmm, I wonder what happened he did an F2 He created an F2 generation and here's how he did it he took F1 Okay, wait, where do I put this? He took purple flowered plants and he crossed them with each other So he took the babies from the F1 generation all like he made so many purple flowered babies That weren't that true breeding Line this is the F1 line of purple babies. He grabbed two of them and he's like hmm you guys Make babies and prosper and he called their babies the F2 generation and what he found is that most of the babies were purple But some of them were white and not only were most purple and some of them white But almost to the number 75% of them were purple and 25% of them were white Okay, so now he's going Not only did the trait come back, but it doesn't seem like the trait came back randomly like it seems like it might have come back In Like a pattern like in certain predictable in a predictive at a predictable rate She's like what's going on And I'll tell you right now You already know you could probably figure it out and I'll just give you a little hint Think about meiosis and then I will be back and we will look at what's actually happening With like how did we end up with these results?