In four o'clocks, RR plants have red flowers, Rr have pink Rowers, and rr have white Rowers. If rallele is a loss-of-function allele, a reasonable molecular explanation for the pink phenotype would be ____
O 50% of the functional protein is not enough to give the same phenotype as 100%.
O 50% of the functional protein gives the same phenotype as 100%.
O The functional allele is up-regulated in the heterozygote.
O The nonfunctional allele is up regulated in the heterozygote.