415 words · auto-generated from the episode video
29:22in fact, every single one of the female offsprings has red eyes, but the males are half and half. They're not even doing >> three to one, >> right? >> Now, they're doing half and half, >> right? >> And he identifies that the redey alil is actually on the sex chromosome. And the way sex chromosomes work is we only get one if we're male, right? The white chromosome isn't really a chromosome if I'm completely honest, right? We have X and Y. The Y, like if you look at the two side by side, the X chromosome is this big and has a bunch of extremely important genes. The Y chromosome has absolutely like nothing, [laughter] right? It's like it's it's in really tiny. And it's in fact, it's so tiny
30:03that there's it's like the way the chromosome is like tied up. Um there's a there's a little centromeir that like holds the two strands together. And that the Y chromosome is so tiny that there's very little room for genetic recombination. >> And so that's why like the Y chromosome like your Y chromosome is identical to your dad's Y chromosome to his dad's to his dad's for like 10 generations because it's so small that physically you can't like mix things. Anyways, so the the point is >> he identified a a particular chromosome with that trait, right? >> And the reason why males are coming up
30:4350/50 is because they only get one X chromosome from the mom, right? So either you're going to get the red one or you're going to get the the white one, >> right? >> And that's it. >> The females on the other hand, they're getting one from the mom and one from the dad. And the dad is guaranteed to be red. So even if I get the white one from the mom, the dad is guaranteed to be red. So all of the female offspring are going to have red eye color. >> That's fascinating. Yeah. Yeah. And so we've added another layer here. Yes. >> To because before we were saying the traits uh were not correlated uh you know color, size. >> Yeah. >> But now with sex chromosomes >> now it's like if they're on that sex chromosome then the math is a bit different. And actually the correlated part is the second thing that Thomas
31:24Hunt Morgan did which is he showed that some of the traits