Comments on: The crossover percentage between genes A and B on a given chromosome in fruit flies is determined to be 6%? http://towncreekbandb.com/b-and-b/the-crossover-percentage-between-genes-a-and-b-on-a-given-chromosome-in-fruit-flies-is-determined-to-be-6 Tue, 16 Feb 2010 00:17:59 -0500 http://wordpress.org/?v=2.8.2 hourly 1 By: The BURNiNATOR http://towncreekbandb.com/b-and-b/the-crossover-percentage-between-genes-a-and-b-on-a-given-chromosome-in-fruit-flies-is-determined-to-be-6/comment-page-1#comment-2953 The BURNiNATOR Mon, 15 Feb 2010 22:34:59 +0000 http://towncreekbandb.com/b-and-b/the-crossover-percentage-between-genes-a-and-b-on-a-given-chromosome-in-fruit-flies-is-determined-to-be-6#comment-2953 The other user is right. A and B are located the closest to each other. For each percent of crossing over, geneticists say the genes have a distance between them of one Map Unit. Since A and B only cross over 6% of the time, they are said to be 6 map units apart. Also, A and C are 12 map units apart. One more thing, the genes don't have to be arranged on the chromosome in the order ABC. They could also be arranged as CAB. We wouldn't be able to determine the order of all three genes unless we were given the map distance between B and C. I hope this helped.<br><b>References : </b><br> The other user is right. A and B are located the closest to each other. For each percent of crossing over, geneticists say the genes have a distance between them of one Map Unit. Since A and B only cross over 6% of the time, they are said to be 6 map units apart. Also, A and C are 12 map units apart.

One more thing, the genes don’t have to be arranged on the chromosome in the order ABC. They could also be arranged as CAB. We wouldn’t be able to determine the order of all three genes unless we were given the map distance between B and C.

I hope this helped.
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]]> By: avstne http://towncreekbandb.com/b-and-b/the-crossover-percentage-between-genes-a-and-b-on-a-given-chromosome-in-fruit-flies-is-determined-to-be-6/comment-page-1#comment-2952 avstne Mon, 15 Feb 2010 22:24:59 +0000 http://towncreekbandb.com/b-and-b/the-crossover-percentage-between-genes-a-and-b-on-a-given-chromosome-in-fruit-flies-is-determined-to-be-6#comment-2952 What's best to do with these types of questions is to try and draw a little time line type thing, and use the percentages as units apart. So you know A and B are 6 apart, and A and C are 12 apart. If you think about it, if these three letters have to be in a straight line, it would make sense if they were in the order of A B C. This is becuase thereis 6 spots between A and B, while there is still 12 spots between A and C. So if you look at that little 'time line', you see that B is closest to A, so your answer is B :) Hope that makes sense!<br><b>References : </b><br> What’s best to do with these types of questions is to try and draw a little time line type thing, and use the percentages as units apart. So you know A and B are 6 apart, and A and C are 12 apart. If you think about it, if these three letters have to be in a straight line, it would make sense if they were in the order of A B C. This is becuase thereis 6 spots between A and B, while there is still 12 spots between A and C. So if you look at that little ‘time line’, you see that B is closest to A, so your answer is B :) Hope that makes sense!
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