When a tall pea plant of heterozygous genotype is testcrossed, we obtain 100 pea plants in the progeny. Calculate the number of pea plants that will be tall and dwarf respectively.

When a tall pea plant of heterozygous genotype is testcrossed, the phenotypic ratio will be 1 (tall):1(dwarf). Therefore, if total number of progeny is 100. Then 50% of the offspring will be tall and 50% will be dwarf. So, 50 pea plants will be tall and 50 will be dwarf.