NEET BIOLOGY

Detailed explanation-1: -An organism can be either homozygous dominant ( TT ) or homozygous recessive ( tt ). If an organism has two different alleles ( Tt ) for a certain gene, it is known as heterozygous (hetero-means different).

Detailed explanation-2: -When an organism has two of the same alleles for a specific gene, it is homozygous (homo means “same") for that gene. An organism can be either homozygous dominant (TT) or homozygous recessive (tt). If an organism has two different alleles (Tt) for a certain gene, it is known as heterozygous (hetero means different).

Detailed explanation-3: -In his experiment, Mendel crossed purebred tall plants (TT) with purebred short plants (tt); the original plants are referred to as the parent generation or P1. He took pollen from a flower on the tall plant and used it to pollinate a flower on the short plant in a procedure called Crossbreeding/ Cross pollination.

Detailed explanation-4: -The notation tt means the homozygous condition, wherein the homologous pair contains same alleles of a gene. Alleles are different forms of one gene. In the pea plant, tall and dwarf are the two contrasting traits for stem height. ‘t’ is used for dwarfness, which is recessive.