Cross over values (COV's) can be considered as the relative distance between genes and are used to help construct chromosome maps. Four genes, called P, Q, R and S, are found on the same chromosome. Use the following COV's to work out the sequence of the four genes R to S = 15 P to S = 10 Q to R = 8 P to R = 25 P to Q = 33 The sequence of the genes is A PQRS B SPQR с RSPQ D QSRP E PSRQ
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Answer will be E) PSRQ
Explanation:
- Less the crossover value, less the distance between different gene
- crossover values of different genes are following-
- R-S= 15, P-S=10, Q-R= 8, P-R=25, P-Q=33
- as distance between Q an R is very low then Q and R present side by side.
- among Q and R , P is situated far from Q than R
- Among R and P , S is situated close to P than R
- so the sequence will be PSRQ
- distance between P-S=10, S-R= 15, R-Q=8, so distance between P&Q is 10+15+8=33, so the sequence is verified.
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