Reverse Mapping (branching line method) – Video
Posted: February 23, 2013 at 8:47 pm
Reverse Mapping (branching line method)
My students had a hard time with this genetics question. When I was marking it, it occurred to me that it might be a good idea to show three ways which can be used to solve it. This example shows how to use a branching line method for the solution. You can view this on my blog at universitygenetics-mapping which is on blogspot dot com (YouTube won #39;t let me put in the proper URL!) I #39;ll also post the way that most students started to solve it - by working backward from the mapping equation (d=#recomb/total offspring x 100) as well as a solution suggested by the textbook. You do a trihybrid cross between two organisms: abc+a+b+c with abc/abc. If the distance between ab is 6 cM and there are 22 cM between b and c, what are the numbers of progeny that you would get of each phenotypic class? Assume there are 1800 offspring in total, and that there is zero interference in the double-crossover class. Round numbers to the nearest integer (ie don #39;t use decimals).
By:
Todd NickleLink:
Reverse Mapping (branching line method) - Video
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