A student cross-pollinates 20 pairs of pea plants that are heterozygous for flower color and sows all of the seeds obtained from the crosses. Once the seeds germinate, the student observes that the number of purple-flowered offspring is three times the number of white-flowered offspring. Which question is the experiment designed to test

Complete question:

I failed to find the complete problem, but there are a few questions that are usually of importance when performing crosses. These questions are described in the answer box.

What is the phenotypic and genotypic ratio of the offspring? Which is the inheritance pattern in the population? What is the dominant trait?

Explanation:  

Due to technical problems, you will find the complete explanation in the attached files