Mendel crossed a round and yellow seeded pea plant with a wrinkled and green seeded pea plant. What did the p…

Mendel crossed a round and yellow seeded pea plant with a wrinkled and green seeded pea plant. What did the plants of ${\text{F}}_1$ generation look like in terms of shape and colour of seed ? On self-pollinating ${\text{F}}_1$ generation plants, plants with four types of combinations of characters were seen in ${\text{F}}_2$ generation. Write the combinations along with their ratios.