In this chapter, we focused on linkage, chromosomal mapping, and many associated phenomena. In the process, we found many opportunities to consider the methods and reasoning by which much of this information was acquired. From the explanations given in the chapter, what answers would you propose to the following fundamental questions? How do we know that specific genes are linked on a single chromosome, in contrast to being located on separate chromosomes?

Video transcript

Hey everyone, let's take a look at this question together. The idea of genetic linkage is the basis for a genetic map. This idea states that if there is a blank distance between two linked genes on a chromosome, there is a blank chance that those two genes will be inherited together. So what do we mean when we're talking about genetic linkage? So let's say here is our chromosome. So we have chromosome one and we have chromosome two. So here we have jean one and here we have Gene two and these two genes are linked. So over here we have Gene one and then here we have gene too. And so these are not linked because they are on two different chromosomes. And so based on that idea of genetic linkage, we can see that the ones that are linked are close and then the ones that aren't linked are far apart from each other and they can either be far apart on the same chromosome or here they can be on two different chromosomes. So the idea states that if there is a blank distance between two linked genes on a chromosome, there's a blank chance that those two genes will be inherited together. And so when we have those that are close meaning that the distance between the two genes is small, we have a high chance that they will be inherited together, which means that answer choice. C is the correct answer. Because when we have two genes that are very close together on a chromosome, there's a very high chance that those two genes will be inherited together versus, let's say, two genes that are either not on the same chromosome or very far apart on the same chromosome. Those have a very low chance of being inherited together. So answer choice C. Is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.