The following blanks can be filled only by numbers.1. Gregor Mendel conducted hybridization experiments on garden peas for (P) years.2. Mendel selected (Q) true-breeding pea plant varieties3. In a human population, there are (R) alleles for ABO blood group.4. In Drosophila, genes for white eye and yellow body show (S)% recombination.    The correct arrangement is

Gregor Mendel, conducted hybridisation experiments on garden peas for P- seven years (1856-1863).Mendel selected Q- 14 true-breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits.In a human population, there are R-three alleles for ABO blood group.In Drosophila, genes for white eye and yellow body show only S-1.3 per cent recombination.Therefore, S< R< P< Q