Answer:
The correct answer would be allele.
Alleles refer to the alternative form of a gene that may result in different forms of traits of the same character.
For example, T and t are the alleles of the gene responsible for controlling the height of a plant. T codes for the tallness of the plant whereas t codes for dwarfness of the plant.
Similarly, in human blood groups [tex]I^{A}[/tex], [tex]I^{B}[/tex], and i are three alleles of a gene responsible for the blood group.
