Answer:
Its a recessive gene
Explanation:
It was passed down by their grandparents, or great grandparents
1. Tt, Tt
2. RR, Rr
3. 50% homozygous
4. Pp Pp
5. 50% purple flowers
6. Pp, Pp, purple heterozygous
7. pp pp
8.SS, Ss or SS, SS
9. Parents were SS, Ss
Answer: B or A