Answer:
The correct answer would be "dominance".
The principle of dominance states that the the dominant trait expresses itself over the recessive allele in a heterozygous condition.
For example, in Tt the T is the dominant trait due to which the phenotype of a plant becomes tall.
Similarly, the plant with Rr would bear round seeds as R is the dominant trait which codes for round seed and r is the recessive trait which codes for wrinkled shaped seeds.
