1. Tardigrade
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  3. Biology
  4. 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 varieties. 3. 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

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Q. 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 varieties.
$3.$ 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

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Solution:

Gregor Mendel, conducted hybridisation experiments on garden peas for 7 years (1856-1863) and proposed the laws of inheritance in living organisms. Mendel selected 14 true-breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits. In a human population there are 3 alleles for ABO Blood group (IA, IB and i). In Drosophila, genes for white eye and yellow body show 1.3 % recombination