How many nucleotides are needed to specify three amino acids?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination

1. in a certain species of plant, the color purple (p) is dominant to the color white (p). according the punnett square, what is the probability of and offspring being white? 50%25%0%100% 2. in a certain species of plant, the color purple (p) is dominant to the color white (p). according the punnett square, what is the probability of and offspring being white? 0%100%50%25%(picture 1 is for question 1, and picture 2 is for question 2)