Round seed in dominant over Wrinkled seed in pea. If F1 population of pea are self-pollinated the off spring will be

Round seed is dominant over Wrinkled seed in peas. If the F1 population of peas is self-pollinated the offspring will be 25 % round, 50% heterozygous and 25% wrinkled.
That means the ratio will be 1 : 2 : 1 in the F1 generation when a dominant round pea seed is selfed with a wrinkled recessive seed.