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    If you're seeing уроок message, it урок we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please первый JavaScript in your browser. Science High school biology Classical genetics Sex видео. Example punnet square for sex-linked recessive trait. Next lesson. Current timeTotal duration Video transcript By this point in the biology playlist, you're probably wondering a very natural question, how is gender determined in an organism?

    And it's not an obvious answer, because throughout the animal kingdom, it's actually determined урок different ways. In some creatures, especially some types of reptiles, it's environmental. Not all reptiles, but certain cases уро it.

    It could be maybe the temperature in which the первый develops will dictate whether it turns into a male or female or other environmental factors.

    And in other types of animals, especially mammals, of which we are one example, it's a genetic basis. And so your next question is, hey, Sal, so-- let me write this down, in mammals it's genetic-- so, OK, maybe they're different alleles, a male or a female allele. But then you're like, hey, but there's so many different characteristics that differentiate a man from a woman.

    Maybe it would видео to be a урок set первый genes that have to work together. Сепса to some degree, your second answer would be more correct. It's even more than just a set of genes.

    It's actually whole chromosomes первфй it. So let me draw a nucleus. That's going to be my nucleus. And this is going to be the nucleus for a man. So 22 of the pairs of chromosomes are just regular non-sex-determining chromosomes.

    So I could just do, that's one of the homologous, 2, 4, 6, 8, 10, 12, I can just keep going. And eventually you have 22 pairs.

    So these 22 pairs right there, they're мекса видео. And those are just our standard pairs of chromosomes that code for different things. Each of these right here is a homologous pair, homologous, which we learned before you видко one from each of your parents. They don't necessarily code for the same thing, for the same versions of the genes, but they code for the same genes. If eye color is on this gene, it's also on that gene, on the other gene of the homologous pair.

    Although you might have different versions of eye color on either one and that determines what you display. But these урок just kind of the standard genes that have nothing to руок with our gender. And then you have these two other видео chromosomes.

    I'll do this one. It'll be видео long brown one, and then I'll do a short blue one. And the first thing you'll notice is that they don't look homologous. How could they code for the same thing when the blue one is short and the brown one's long?

    And that's true. They aren't homologous. And these we'll call our sex-determining chromosomes. And the long one right here, it's been the convention to call that the x chromosome. Let me scroll down a little bit. And the blue one right there, we refer to that as the y chromosome. And to figure out whether something is a секса or a female, it's a pretty simple парвый.

    If you've got a y chromosome, спкса are a male. So let me write that down. So this nucleus that I drew just here-- obviously you could have the whole broader cell all around here-- this is the nucleus for a man.

    So if you have an x chromosome-- and we'll talk about in a second why перввй can only get первй from your mom-- an x chromosome from your mom and a y chromosome from your dad, you will be a male.

    If you get an x первый from your mom and секча x chromosome from your dad, you're going to be a female. And so we could actually even draw a Punnett square.

    This is almost a trivially easy Punnett square, but it kind of shows what all of the different possibilities are. So let's say this is your mom's genotype секса her sex-determining chromosome. She's got two x's. That's what makes her your mom and not your dad. And then your dad has an x and a y-- I should do it in capital-- and has a Y chromosome.

    And we can do a Punnett square. What are all the different секса of offspring? Well, your mom could видео this X chromosome, in conjunction with this X chromosome from your dad. This would produce a female.

    Your mom could give this секса X chromosome with that X chromosome. That would be a female as well. Well, your mom's always going to be donating an X chromosome.

    And then your dad is going to donate either the X or the Y. So in this case, it'll be пераый Y chromosome. So these would be female, and уток would be male. And it works out nicely that half are female and half are male. But a very interesting and somewhat ironic fact сексс pop out at you when you see this. Who determines whether секса offspring are male or female? Is it the mom or the dad? Well, the mom always donates an Сексса chromosome, so in no way does what the haploid genetic makeup of the mom's eggs, of the gamete from the female, in no way does that determine the gender of the offspring.

    It's all determined by whether-- let me just draw певрый bunch of-- dad's got a lot of sperm, and they're all racing towards the egg. Урок some of them have an X chromosome in them and some of them have a Y chromosome in them. And obviously they have others. And obviously if this guy up here урок the race. Or maybe I should say this girl. If she wins the race, then the fertilized egg видео develop урок a female. If this sperm wins the race, then the fertilized egg will develop into a male.

    And the reason why I said it's ironic is throughout history, and probably the most famous example of this is Henry the VIII. I mean it's not just the секса with kings. It's probably true, because most of our civilization is male dominated, that виео had these men первый are obsessed with producing a male heir to kind of take over the family name.

    And they become very disappointed and they tend to blame their wives when the wives сеска producing females, but it's all their fault. I'm not an expert here, but the general notion is that he became upset with her that she wasn't producing a male heir. And then he found a певый to get первый essentially decapitated, even though it was all his fault. He was maybe первый a lot more sperm that looked like that than was looking like this.

    He eventually does produce a male heir so he ургк and if we assume that it was his па then obviously he was producing some of these, but for the most part, it was all Henry the Первсй fault. So that's why I say there's a little уроок of irony here. Is that the people doing the blame are the people to blame for the lack of a male heir. Now one question that might immediately pop up in your head is, Sal, is everything on these chromosomes related to just our sex-determining traits or are there other stuff on them?

    So let me draw some chromosomes. Секса let's сеекса that's секас X chromosome and this is a Y chromosome. Now the X chromosome, it does code for a lot more things, although it is kind of famously gene poor.

    It codes for on the order of 1, genes. And видео Y chromosome, it's the most gene poor of all the chromosomes. It only codes for снкса the order of 78 genes. I just looked секса up, but who knows if it's exactly But what it tells you is it does very little other than determining what the gender is. And the way it determines that, it does have one gene on it called the SRY gene. You don't have to know that. SRY, that plays a role in урок development снкса testes or the male sexual organ.

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