(B) A dominant gene is a gene that is expressed or appears in an organism in the presence of any another gene. Whereas, a recessive gene is a gene that is suppressed in an organism (doesn’t appears) in the presence of a dominant gene. A recessive gene is expressed or appears in an organism only if the other gene present is recessive.

Example- Height in Pea plant. Tall Plants may have gene combination of TT or Tt. (where T is a dominant gene). Dwarf plants will only have gene combination of tt(where t is a recessive gene)