only SS only Ss Ss or SS ss or SS
I gave my students this multiple choice question: In pea plants, the allele for smooth peas is dominant (S). If a heterozygous smooth pea plant (Ss) is crossed with a homozygous smooth pea plant (SS), which are the possible genotypes the offspring could have?

Only one answer is correct among these 4 choices:
- only SS
- only Ss
- Ss or SS
- ss or SS

Could you tell me which one is correct?

Ss or SS