| Genes P, Q, R and S occur on the same chromosome. | |||
| Investigation of a large population produced the following cross over values between pairs of genes. | |||
| P and R | 34% | P and Q | 59% |
| R and S | 12% | S and Q | 37% |
| Which one of the following sequences of letters represents the sequence of genes on the chromosome? | |||
A) PRSQ
B) PSRQ
C) QSPR
D) BQSP
Correct Answer: B
Solution :
In a linakge group,, the relative frequency of crossing over is a measure of the distance apart of genes. The higher the percentage, the further is the distance between the two genes. Therefore, the sequence of the genes is PSRQ.
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