Answer: The correct answer is- " Simple dominance".
Simple dominance refers to the expression of one allelic form of a gene (that is dominant) over the other form (that is recessive).
Example- T allele is dominant that represents tall plant height over t (for dwarf), which only expresses in the absence of dominant allele.
On the contrary, pleiotropy means one gene is responsible for more than one characteristic or phenotypic trait of the organism.
Codominance means equal expression of both the alleles (like AB blood group) of a gene. Incomplete dominance occurs when none of the alleles is completely dominant resulting in an intermediate phenotype.
Thus, simple dominance is the right answer.
