My AP Biology Thoughts  Unit 5 HeredityWelcome to My AP Biology Thoughts podcast, my name is Victoria Villagran and I am your host for episode #101 called Unit 5 Heredity: Linked Genes. Today we will be discussing linked genes and their characteristics!Segment 1: Introduction to Linked Genes Linked Genes A form of non-mendelian inheritance Discovered by Thomas Hunt Morgan, using the fruit fly Drosophila melanogaster Genes on the same chromosome, making them more likely to be inherited together If crossing over occurs, then they are no longer linked it will look like independent assortment If they are linked, they will not assort independently and the ratios of the offspring will different If there are more parental phenotypes, then it is linkedIf there are more recombinant then is it non-linked The recombination frequency is very small. If the genes are far apart on a chromosome, or on different chromosomes, the recombination frequency is 50%. ... If the recombination frequency is less than 50% we say the two loci are linkedRecombinant and Map Units:The farther apart the genes are on the chromosome, the more likely they are to separate because of crossing over resulting in recombinant offspring Recombinant offspring generally appear in proportions related to the recombination frequency between the two genes:Calculated by dividing the number of recombinant progeny by the total number of progeny This can be used to calculate map units or how far away the genes are from each other Segment 2: More About Linked Genes Let’s look at fruit fliesIf linkage held true, then F1 would only have the two parental phenotypes in a 1:1 ratio The genes for eye color and the genes for wing length are on the same chromosome, thus are inherited together. A cross between gray and normal with black vestigialThere are more parental phenotypes with 965 and 944 than recombinant with 206 for gray and vestigial, and 185 with black normal. There is an expected 575 frequency for each...