EVERYDAY SCIENCE

Detailed explanation-1: -The correct option is A True. The cross involving only one pair of contrasting characters is called the monohybrid cross. For example, crossing two pea plants and considering their height as the only trait in the cross.

Detailed explanation-2: -A monohybrid test cross is the process by which you cross two organisms that are heterozygous for a given trait. In such a case, by the law of dominance and by using the Punnett square, you know that the proportion of the offspring produced will be 25% homozygous dominant, 50% heterozygous and 25% homozygous recessive.

Detailed explanation-3: -A monohybrid cross results in a phenotypic ratio of 3:1 (dominant to recessive), and a genotypic ratio of 1:2:1 (homozygous dominant to heterozygous to homozygous recessive).

Detailed explanation-4: -Example of monohybrid cross: One plant was tall and another plant was dwarf. Both the plants were homozygous. The genotype (genetic composition) of a tall plant was TT and that of short plant was tt. Mendel crossed the two plants which produced offspring or progeny known as F1 generation (first filial generation).

Detailed explanation-5: -A monohybrid cross is defined as the cross happening in the F1 generation offspring of parents differing in one trait only. A dihybrid cross is a cross happens F1 generation offspring of differing in two traits.