AP BIOLOGY

Detailed explanation-1: -1 Answer. 25% of the heterozygous cross are short, and the offspring of a homozygous dominant and homozygous recessive pea plant will always display the dominant trait (phenotype), because they are heterozygous.

Detailed explanation-2: -A homozygous short pea plant will have the genotype tt. A cross between a homozygous tall tree plant and a homozygous short tree plant will give the following genotypes of the offspring: 100% Tt. Since the offspring has at least one allele that is dominant for tall trees, all the offspring will be tall.

Detailed explanation-3: -When a homozygous tall pea plant and a homozygous short pea plant are crossed, the next generation are all heterozygous and the dominant allele is expressed in all the plants, and the recessive trait seems to disappear.

Detailed explanation-4: -When a pure tall plant (TT) is crossed with the pure short plant (tt), then the progeny in the F1 generation will be hybrid (Tt). When the F1 generation is self-crossed (Tt), then in the F2 generation, the progeny produced will be tall homozygous (TT), Tall heterozygous (Tt), and dwarf homozygous in the ratio of 1:2:1.

Detailed explanation-5: -In F2 generation, the tall and dwarf plants will be produced in 3 : 1 ratio. Out of the three tall plants, one tall plant will be homozygous tall (TT) and two tall plants will be heterozygous tall (Tt).