Write a short essay that discusses how crossing over can be detected and how the resultant data provide the basis of chromosome mapping.

Video transcript

Hello, everyone. Here's our next question blank. Show the relative locations of genetic markers on a chromosome and are based on how frequently the markers are inherited together. When we make a map essentially of locations of where genes are on a chromosome based on how frequently they're inherited together. That's as indicated we are making a map because we're indicating location. So that's going to be choice. A genetic linkage maps. So we have a map indicating gene location, but it's determined by how frequently they're inherited together, which tells us how closely they're linked. The more often they are linked together inherited together, the closer the genes must physically be on the chromosome. So let's just look through other answer choices to understand why they're not correct choice B says genetic Los I and genetic Los I. R. Those fixed locations on the chromosome where certain genes are found. So the low side are the locations. We make a map of those locations. So that's not a correct answer. Since it's not something that shows relative locations. The low side of the locations themselves. We're on to pedigree charts and pedigree charts have sort of a meaning you may have heard in maybe laypersons terms like if you think about race horses or something where it would actually show like essentially the family tree of a horse. Um Its pedigree, but in genetics, the meaning of a pedigree chart is a map that depicts the incidents and manifestation of phenotype of a given gene in the family tree. So you'd be looking at, say, the gene for hemophilia. And you want to say, let's look at this family and see which individuals are affected which individuals are carriers. You draw the family tree indicating um which individuals are affected by this specific gene to look at its pattern of inheritance. So that's what a pedigree chart is, but it's not what we're looking for. So we'll eliminate that. And then finally, we have choice de punnett Square and a pocket square is of course that basic tool of genetic studies. That square diagram used to predict the outcome of certain genotype crosses. So the other genotype of each parent on the top and the side. And then you predict the outcome of that particular cross, but not what we're looking for. So not our answer. So again, choice a genetic linkage maps. So the relative locations of genetic markers on a chromosome and are based on how frequently the markers are inherited together. Hope to see you in the next video