An organism of the genotype AaBbCc was testcrossed to a triply recessive organism (aabbcc). The genotypes of the progeny are presented in the following table. 20 AaBbCc 20 AaBbcc 20 aabbCc 20 aabbcc 5 AabbCc 5 Aabbcc 5 aaBbCc 5 aaBbcc Answer part (a) again, assuming the three genes are so tightly linked on a single chromosome that no crossover gametes were recovered in the sample of offspring.

Video transcript

Hello everyone and welcome to today's video. So the following are the result of the F two generation of a three point cross. What is the recombination frequency of lossy ap And here we have it in the table. It is this column here. Now Recall from previous videos what the formula for the recombination frequency is going to be. And here we have it. It is a number of recombinant divided by the total number of offspring times 100%. Because this is a percentage. If you look at the table, these recombinant are already laid out for us and they're going to be signal here Is going to be these four numbers that we see. Now if we add this number of progeny up, we're going to obtain the total number of continents is 40 and the total number of offspring is going to be 155 times 100% according to our formula. And once we perform this calculation we're going to obtain that their combination frequency is 25.8%. Which is going to be represented by answer choice B. I really hope this video helped you and I hope to see you on the next one