What is the genotype of the pink flowers?

Pink flowers are the results or offspring of the cross of red and white parental generation. Red flowers gentoype are generally referred to as RR, the uppercase R refers to the red pigment which is dominant over the ww, or white recessive. Using a punnett square of the RR x ww cross...

RR x ww

Rw Rw genotype: 1 (100%) Rw

Rw Rw phenotype: 1 (100%) pink

...yields 100% pink flowers with the genotpe of Rw. An easy way to remember the difference between phenotype and genotype is that both phenotype and physical begin with ph and pehnotype refers to physical appearances/frdcriptions.