A recessive allele is expressed in

Options

A. heterozygous condition only
B. homozygous condition only
C. `F_(3)` generation
D. both homozygous and heterozygous conditions

Answer

B

Explanation

The factor of an allelic or allelomorphic pair which is unable to express its effect in the presence of its contrasting factor in a heterozygote is called recessive factor or allele, e.g, the allele 't' in hybrid tall pea plant Tt. The effect of recessive factor becomes known only when it is present in the pure or homozygous state, e.g, tt in dward pea plant.