Whenever a pea plant with homozygous dominant trait for a character is cross-fertilized with the plant having contrasting recessive trait, we observe:

Whenever a pea plant having homozygous dominant trait is cross-fertilized with the plant having contrasting recessive trait, all the ${\mathrm{F}}_1$progeny show dominant trait. The ${\mathrm{F}}_1$progeny formed after the cross is genotypically in heterozygous condition. We know that in a heterozygous condition only the dominant trait is expressed.