A gene is said to be dominant, if

Options

A. It is expressed only in heterozygous combination
B. It is expressed only in homozygous combination
C. It is expressed in both homozygous and heterozygous condition
D. It is expressed only in second generation

Answer

C

Explanation

An allele is said to be dominant that express itself and hide the effect of other. It may occur both as homozygous and heterozygous state.
Ex : TT or Tt (tallness).