Gene Mapping — Prelims Questions

In a test cross involving two linked genes, P and Q, a dihybrid individual ($PQ/pq$) is crossed with a homozygous recessive individual ($pq/pq$). Out of 1000 offspring, 350 show the parental phenotype $PQ$, 350 show the parental phenotype $pq$, 150 show the recombinant phenotype $Pq$, and 150 show the recombinant phenotype $pQ$. What is the genetic distance between genes P and Q?

Which of the following statements about genetic mapping is INCORRECT?

Genes A, B, and C are located on the same chromosome. The recombination frequency between A and B is 10%, and between B and C is 20%. If the recombination frequency between A and C is 30%, what is the most likely order of these genes on the chromosome?

In a three-point test cross, the least frequent phenotypic classes observed are typically the:

If the coefficient of coincidence (C.O.C.) for two adjacent regions on a chromosome is 0.5, what is the interference (I) value?

Which of the following is NOT a direct application of gene mapping?