Biology, asked by mhaseeb0603, 11 hours ago

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​

Answers

Answered by preety89
2

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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