AP BIOLOGY

Detailed explanation-1: -When a tall and short plant are crossed, all of the offspring are tall. If the offspring self-fertilize, they produce tall and short plants in a ratio of 3:1 in the next generation.

Detailed explanation-2: -In a monohybrid cross, Mendel crossed pure pea tall plants with the dwarf plants and observed that in the first generation, only tall plants appear.

Detailed explanation-3: -Expert-Verified Answer Test cross is performed to identify whether the organism is homozygous or heterozygous. As tall plant can either be of Genotype TT or Tt so to get know either it is TT or Tt the tall plants are crossed with dwarf plants (tt) .

Detailed explanation-4: -For monohybrid cross, Mendel began with a pair of pea plants with two contrasting traits i.e., one tall and another dwarf. The cross-pollination of tall and dwarf plants resulted in tall plants. All the hybrid plants were tall.