Two independent monohybrid crosses were carried out involving a tall pea plant with a dwarf pea plant. In the first cross, the offspring population has equal number of tall and dwarf plants whereas, in the second cross, it was different. Workout the crosses and explain giving the reasons for the differences in the offspring population.
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•The second cross is between tall pea plant and a dwarf pea plant. In this the tall pea plant is homozygous dominant i.e., TT and the dwarf plant if homozygous recessive i.e., tt, so the genotype of parents would be TT and tt. Hence the offspring population produced would be all tall plants.
•In a cross between heterozygous tall plants (Tt) and a homozygous dwarf plant (tt), the ratio in the offspring shall be 1 tall : 1 dwarf. This is because the heterozygous plant will make two types of gametes, one type having T allele and the other having t allele. Hence, the correct answer is '1 tall : 1 dwarf'
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