If you forgot to add x-gal to the agar selection medium, how would the colonies that grow differ phenotypically from the ones that grow in plates with x-gal? briefly explain your answer

If X-gal is not added to the agar selection medium all of the colonies would be white.

X-gal is an organic compound used to test the presence of an enzyme, β-galactosidase. X-gal is colourless, but in the presence of β-galactosidase, it becomes blue because of the cleavage of the β-glycosidic bond inside its structure.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.