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 of the following sequences represents the sequence of genes on the chromosome?
Correct answer: B. PSRQ
- A. PRSQ
- B. PSRQ
- C. QSPR
- D. RQSP
- E. SPRQ
Explanation
This is a tricky question. A question like this also appeared in the AKU 2022 test. Basically, the greater the crossing over percentages, the more the distance between them. P and Q will be farthest from each other. So, we have P in the start and Q at the end. Now we have to find whether S comes first or R. PR frequency is more than PS so S will closer to P. Combining all this data, we get the sequence of PSRQ.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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