If you crossed a round seeded plant with a flat seeded plant

If you crossed a round seeded plant with a flat seeded plant and saw that all 1000 of their offspring only had round seeds, which of the following best describes the offspring of this mating? F1 and homozygous F1 and heterozygous F2 and homozygous F2 and heterozygous

Solution

Round seeded plant crossed with a flat seeded plant.

The F1 had only round seeds.

Round seeds (RR), dominant

Flat seeds (rr), recessive

The F1 has all round seeds (Rr), which is heterozygous