Which of the following are identical DNA molecules?homologous chromosomesXand Ysister chromatids before crossing oversister chromatids after crossing oversister chr...

Crossing-over occurs between a. sister chromatids of the same chromosome. b. chromatids of nonhomologous chromosomes. c. nonsister chromatids of a homologous pair. d. None of these are correct.

Let's quickly review that parts of a crow's um so we have these two primitives, this commentating this come tip tactically Centrum here, which makes them Sister Kermit. It's in This whole thing is a duplicated chromosome. So if a cell is gonna undergo my Asus, it has to be Dad. Floyd between it has two copies ever Region and two copies of Evercore MSM. So let's say, has this is one copy of one come zone, and now it has to. So these two grams owns are the same in that they code with same Jan's and it's Jean cuts with the same thing. But they have different levels. Or they could have different Leal's. They might not. So, for example, this gene could coat for hair color, with one having a dominant one having recess of the wheel. So before my house is, the DNA will be duplicated, which creates are duplicated chromosome. So now we have again we still have the dominant the wheels on both of these now, and recess it on both of the green ones. Now this whole thing is called a home, a locus pair in a process called synapses. This home Louise pair will be forming a Ted track, which is a structure made of these two chromosomes. And this is when crossing over can occur. So here you can see what crossing over and look site. They're touching at this point, which means that they're crossing over and they're going to exchange genetic material. So that leaves us with two chromosomes that now are not identical. Their sister comets are no longer identical because now that exchanged part of the chromosome. And now the A Leal's would be a dominant one here in a recess of one dominant and a recessive. So they've exchanged their genetic material, as in this gene exchanged or this committed exchanged a recessive Oh, sorry, I I wrote this wrong. Did I know? Never Month. So this one right here the red chromosome exchanged a dominant Eliel for a recess it khalil of the same gene. So let's say the dominant hair color was brown and the recess It was blunt. It exchanged brown for blonde here. So when does cresting over happened? First of all, it happens with non sister permitted. It's so if we look at this right here, this is this in this our sister cramped IDs This in this excess er crump Kids. We exchanged a red with green, which means they're non sister grown kids. If we exchange sister counted zit wouldn't even extents because of sister come kids before crossing over are exactly the same. See, this sign is the same saseidx until crossing over occurs. And we're also dreaming only with Homa locus pairs as in within the current, the home Lois pairs. So if we did it outside, we would be exchanging the wheels with jeans that don't even the same gene. It just would mess things up. But here we're exchanging the wheels of the same Gene Simmons. Our answer is C.

Hi or for single, of course, between profits first and Matter face first, and it is the process of co two home all august no sister models pair up with each other and extend different segments of printed material to form to recommend the cronyism sister commanders. So answer is homologous non sister commanded. Okay, thank you. What?

So we were asked that in which stage would we find uh plasma to me correct the spelling real quick. Um So what is Kosmina in the first place? So in previous videos we were talking about crossing over and how the synaptic nemo complex or the proteins between paternal set of chromosome and maternal set of chromosomes were aligned on top of each other parallel to each other. And this alignment is especially important in the process of crossing over. Oh, so we do have the two chromosomes aligned on top of each other. But how do they exchange genetic information? And that is when the sky as matter comes along. Canada's matter um is where some parts of the chromosome attached to the other chromosome and directly swap genetic information with each other. Uh After kenya's mara, you might find the chromosome having some set off uh the other chromosomes information. Yeah. Uh huh. And sometimes uh it slaps the information back so I have it. Mhm. So this is not the chaos Mata formation itself. This is the result of the crossing over that occurs after chaos mara. But chaos mara is where the exchanging is happening, like when it attach is uh right onto the other chromosome. Uh This happens to proteins known as the chi asthma that links the pair of homologous chromosomes. Um During pro Phase one Profit is one is the phase of mitosis. one we're crossing over happens and there are genetically distinct chromosomes that form after this process this. In addition, with independent assortment, bring a diverse set of gametes and uh and bring diversity into the gene pool which are essential for animal species. And uh that is all thanks for watching.

So we were asked that in which stage would we find uh plasma to me correct the spelling real quick. Um So what is Kosmina in the first place? So in previous videos we were talking about crossing over and how the synaptic nemo complex or the proteins between paternal set of chromosome and maternal set of chromosomes were aligned on top of each other parallel to each other. And this alignment is especially important in the process of crossing over. Oh, so we do have the two chromosomes aligned on top of each other. But how do they exchange genetic information? And that is when the sky as matter comes along. Canada's matter um is where some parts of the chromosome attached to the other chromosome and directly swap genetic information with each other. Uh After kenya's mara, you might find the chromosome having some set off uh the other chromosomes information. Yeah. Uh huh. And sometimes uh it slaps the information back so I have it. Mhm. So this is not the chaos Mata formation itself. This is the result of the crossing over that occurs after chaos mara. But chaos mara is where the exchanging is happening, like when it attach is uh right onto the other chromosome. Uh This happens to proteins known as the chi asthma that links the pair of homologous chromosomes. Um During pro Phase one Profit is one is the phase of mitosis. one we're crossing over happens and there are genetically distinct chromosomes that form after this process this. In addition, with independent assortment, bring a diverse set of gametes and uh and bring diversity into the gene pool which are essential for animal species. And uh that is all thanks for watching.