Answer:
The pea plant can make 8 varying gametes and they are
1. YRI
2. YRi
3. YrI
4. Yri
5. yRI
6. yRi
7. yrI
8. yri
In order to fit all these gametes in a self-pollination, it is required that a punnett square have 8 columns and 8 rows. This would enable it to have spaces for the entire 64 possible unions of gametes in its offspring. Explanation: