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Analblno mouse was crossed to _ black mouse: The F1 were all agouti: What (raction of the F2 are expected to black? 4160.3/169/1604.1/16...

Question

Analblno mouse was crossed to _ black mouse: The F1 were all agouti: What (raction of the F2 are expected to black? 4160.3/169/1604.1/16

Analblno mouse was crossed to _ black mouse: The F1 were all agouti: What (raction of the F2 are expected to black? 416 0.3/16 9/16 04.1/16



Answers

A purebred brown mouse is repeatedly mated with a purebred white mouse, and all their offspring are brown. If two of these brown offspring are mated, what fraction of the $F_{2}$ mice will be brown?

Okay, We have one brown male mouse that we are crossing with two black female Nice. And in the first case, we get nine black offspring and seven brown. Mom, too, has a much bigger litter. That's not really super important for us to know, But she has 57 black offspring and zero brown. Well, when we have a scenario where we have all black, I'm going to assume right from the get go that probably Brown is a recess of Trickett. So if Black is dominant, uh, let's just call these be Bigby for dominant and little B for recessive Dad has to be a little bit little B in order to have the brown fino type. So if we did it a quick opponent square down here Let's just say we want to see what happens if we have a mom who is head arose, I guess, and crossed with that dad who is little be little B, we would see our Gino types that we would have 50% of the population would be Bigby little B and 50% would be a little bit a little B. These things 50% is gonna be brown And since Black is dominant, this this half of the group is going to be black. And that is actually what we see in Mom one over here, even though says a small sample size, we can probably assume that that's correct. So this mom has to be hetero zegas. And then we can assume since this mom had only black mice, she is probably almost, I guess, dominant.

The little for, um, Calvinism for making albinos in mice. And, of course, big C is black. Okay, so let's look at the outcomes. Will the outcome? Of course. It could depend on stroke slowly on the headers. I go. Right. So what we'll find is the half of the mice. All right, we're gonna get the big C Leo from this mouse and a little see Leo from this mouth. And so it would be big seat a little. See hitters, Vegas and this half a black coat and then half of them. We'll get the little See Leo from this mouse and a little Sierra Leone's from this mouth. Because this one only has it will see illegals to give, and it will be on albino as a consequence. All right, so that's the situation. 50% of the time. We would expect amounts to be black 50% of the time. We expect the mouse to be albino. Were asked, What's the probability that the 10 babies that this couple has, um, all end up being black? What's the probability that they're all black? Well, remember that each baby is an independent event, so we have to use the product law, which is also called The Rule of Complication. Um and so the probability that the first mouse is black, he's 1/2. Probably the second mouse is black is 1/2 and so on. Right, So the probability that each mouth ends up being black is 1/2. And of course, the same is true. Was being no, my No. Right. So we could ask the question, What's the probability that amounts is gonna be up? I know it's still one. How so? They're 10 mice, so I need to write down 1/2 10 times. I think I'm up to eat 123456 70. So this is nine and 10 All right. Another way to do that is simply toe to go one over to to the 10. All right, It's the same calculation. But either way, if you actually do the math, it's one in 1024. So there's less than ah one in 1000 chance that the makes will, um, all be black. If you do the division on that Ah, it's 0.9 and then if you move the decimal point to their over two places the right. Then it's 0.9%. So 9 1/100 percent chance. So, regardless of which number you like, obviously it's a very small number.

Their students today. We're going to be answering this question in regards to the chapter on Mendell and the jeans. So the question here read says two black female mice, um, happened to cross paths with a brown male mouse. Um, in several letters. Female one produced nine black and seven brown offsprings while, um, female to produce 57 black offsprings. So, based off of that information, um, the question is, what deduction can we make about the inheritance of black and brown coat color and mice? And also, what are the Gina type of female one and a female, too? Let me deposit video and drop down what you think those are, and we can go over there shortly. Okay, If you answer the question, let's refuse. So for the first question, what can we do? What can we the duck about? The inheritance of black and brown, um, coat, color and race, Um, that we can obviously tell that black is dominant over brown because the only kind you've seen Brown was, um, just seven of those springs hat brown. But, um, if you just calculate that we can actually see that, um, we can see that like 66%. 66 in total. Um Oh. I just add a 57 to 9 that in total 66 of the, um of the offsprings are mostly black. So it makes sense that when it comes to their for color, that black is just more dominant over brown. And for the second question, what are the genotype for female one? A female to Well, it's safe to say for the first female, um, the first female has to be hetero Sica's because how she able to have the brown mice, um, Brown mice is safe to say that, um, that she probably yeah, my cancer. Her family members have probably dad. She has a hetero cycles built either, like one of her mouth is when the parents probably is brown or that they vote for hetero cycles. And she ended up with that, um, set up and for um, the female to it's safe to say that she probably was, um, just dominant in black, like she has a two B's. So when it comes down to her Children, that explains why all of her Children come out, came out looking, having black coats and why um, none of them end up looking like their father. So having their well, they probably look like him, but they probably end up with their father's coat for color. And yep, that's it. I hope you found this very helpful and informational. And please feel free to look at, um, other videos that would answer or explain certain questions you have regarding to this chapter or other chapters that you may be engaged in. Okay, Bye.

All right. So we're going to find squares to figure out this question and says we have a geneticist that takes a that takes grey mice and crosses them with white mice. And it says all of the offspring, the progeny fancy word for all spring or the kids that would produce all those offspring or gray, and that tells us that Gray is dominant. Now, the thing is, if something is dominant and, um, I don't think it tells you what letters to use here, we're going to use G here, so G Capital G is gonna represent Gray Lower case G is gonna represent white. And so if a mouse is gray, it could have a Gino type of big G little G or Biggie Biggie. Okay. And then a white mice is always going to be a little G little G. Now, the reason for that is that Big G represents the dominant trait, which is grey. And any time you have at least one dominant alil for these problems, um, it's gonna be in the mice is gray. Now, the question to figure out is, Are these grey mice biggie little G or biggie? Biggie. If we do Opponent square. And we say that there big G, little G and the white meister little G, little G we would see. And this would be gray. This would be gray and then these would be white. And so if the grey mice from this first generation appear a biggie little G, we would expect about half the offspring be gray and half the offspring be white. But what we see is that all the offspring or gray so that tells us that these grey mice up here have to be a big G little G. Okay, So if we continue, it says the progeny from this first generation, which we have to figure out. So this grey mice appears Biggie biggie In this white mice is little G, little G and all of its offspring. The progeny are gonna be big G, little G. Okay, so it says it takes the progeny the offspring from this first cross and crosses them together in the second generation. And so, if I take one of the mice from the 1st 1 with another mice from the 1st 1 I have to Both of them are biggie little G and we would see that if we crossed those mice, This would be gray, gray, gray and white. So it for doing this problem right? The cross of the offspring from the first generation, if they were crossed together, would produce 75% mice that were gray and 25% of the mice would be white. Now, we get to check our answer by looking at how many mice were actually produced from that second generation. And it tells us that 198 we're gray and 72 or white, and so we need to figure out what is the percentage here. In order to do that, I need to add 1 98 in 72. Someone doing calculator right now. So if I do 1 98 plus 72 I get to 70. So now I figure out the percentage I do 1 98 divide about 2 70 That'll tell me what percentage of the mice are gray, which is 73.3%. And then I'm gonna race this. I need to figure out what percentage or whites of 72 divide about 2 70 and that is about 26.7% so not exact, because this is not a new exact thing. It just gives you general numbers, their predictions. But our numbers are very close. And so that tells us that we were doing the question correctly. So what the scientists did is he took a grandma grey mice that were biggie biggie sorry, crossed him with white mice that were little G little G produced offspring that were all big G. Little G took two of those offspring, crossed it together and then produced 198 grey mice, which is 73% 72 white mice, which is 26.7%. And that lines up with what we would predict. So that would be the answer, the question, and I hope that was helpful.


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