(1)Mendel crossed pure-breeding pea plants grown from round seeds with purple flowers with pure-breeding plants grown from wrinkled seeds with white flowers. All the progeny were round seed, purple flowers. Explain this with a suitable genetic diagram.

Question

(1)Mendel crossed pure-breeding pea plants grown from round seeds with purple flowers with pure-breeding plants grown from wrinkled seeds with white flowers. All the progeny were round seed, purple flowers. Explain this with a suitable genetic diagram. 
I drew a punett square and got all to be round seed, purple flower.)

2)When the plants from Q1 were self-pollinated the following season, the following seeds were produced 
Phenotype |Genotype|N° of seeds 
round,purple | ? |317 
round,white | ? |105 
wrinkled,purple| ? |106 
wrinkled,white | ? |36

a)Which characteristics are not seen in the parents?What does this mean? 
b)What is the ratio of phenotypes produced? 
c)Draw a genetic diagram justifying these results 
d)Cross the heterozygous dominant F1 with the homozygous recessive pea plant. What ratio and phenotypes are produced?Can you think of a use for this?

PLEASE HELP!!!explanations wud be gud