Question

In case of round yellow and green wrinkled, which is a dominant trait

Answer 1

Mendel in his experiment choose 7 visible traits that he can easily visibly study for this experiment. 

Trait Color of Seed Albumen
Dominant - Yellow
Recessive - Green

Trait Form of Ripe Seed
Dominant - Smooth: Round
Recessive - Wrinkled

Other traits for your reference

Trait Color of flower
Dominant - Purple
Recessive- White

Trait Form of Ripe Pods
Dominant - Inflated
Recessive- Constricted

Trait Color of Unripe Pods
Dominant - Green
Recessive- Yellow

Trait Position of Flower
Dominant - Axial
Recessive- Terminal

Trait Length of Stem
Dominant - Tall
Recessive- Dwarf/Shor

Answer 2

In such case round RR and yellow YY are dominant traits and green yy and wrinkled rr are recessive traits so the offspring will be round Rr and yellow Yy dominating over wrinkle rr and green yy traits.
The offspring will have heterogeneous alleles Round Rr and Yellow Yy and Green and wrinkled traits will be there as recessive genes and will show in next generation.