Genetics

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The question is as follows: The round trait is dominant over recessive wrinkled peas. A homozygous round pea mates with a homozygous wrinkled pea. The resulting F1 generation is self crossed and 900 round pea plants and 100 wrinkled plants are observed. What is the penetrance of the Wrinkled genotype?

I already figured out that there is a 25% chance of getting wrinkled pea plants using the regular Mendelian punnet squares but I don't know what to do with the numbers of 100 and 900 given.

thank you!

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