Answer:
incomplete dominance
Step-by-step explanation:
Pink flowers occur because the allele for red flowers is not completely dominant over the allele for white flowers.
In biology, incomplete dominance refers to the specific characteristic of an allele not being completely expressed over its paired allele. As a result, a new hybrid allele is formed.
In this case, the red flower allele is not completely expressed over the white flower allele, resulting in pink flowers.