Crazy multi choice Q (try it out)

[Faraz]

Alright this questions a killer, at least for me 
try it out see if you can work it out

Question:

Four genes found on the same chromosome are represented by R, S ,T and U. The percentage recombination between the genes is

R-T 7%
S-T 37%
S-R 30%
R-U 20%
T-U 13%

The sequences of genes along the chromosome must be

A. R,S,U,T
B. T,R,S,U
C. U,R,T,S
D. S,R,T,U



GOOD LUCK!!!  :angel:

[NE2000]

OK, S-T are most separated on the chromosomes. R is a locus between S and T. The remaining point is U, which is 13 units away from T and 20 units away from R. So it is further along the chromosome from T, which would explain why it is further away from R than T.

Therefore the order is (hopefully) S,R,T,U

The answer hopefully is D

Am I right?

[Faraz]

yessssss wow it toook me um 13 mins to work that out

is there something you know that I dont???

..units???.....  are they the %'s??


wait shouldnt it be the higher the % the closer the gene loci???

[shinny]

I don't remember too much about this, but isn't it because if they're further apart, theres more potential length of chromosome to be spliced, and hence a greater percentage?