Consider a test cross between a homozygous recessive yellow seeded plant with a plant having an unknown seed. 50% of the offspring in F1 generation have yellow seeds and 50% have green seeds.

Which of the following statements is/are TRUE about the cross?

1: The unknown seed is homozygous recessive for green.

2: The unknown seed is heterozygous for green.

3: All the offspring in the F2 generation will have green seeds.

4: All the offspring in the F2 generation will have yellow seeds.