Provide the full answer of the given problem

Problem- Tired of watering his garden, your instructor is attempting to grow desert plants. One such plant is Indian paintbrush. A yellow variant has shown up, and we would like to determine if this variant is a Mendelian trait. We have taken a pure breeding red plant and crossed it with a pure breeding yellow plant. The resulting plants were selfed with the following results:

Red Flowers 205

Yellow Flowers 93

Perform a chi square analysis on this data using the following hypothesis:

The yellow allele is a simple mendelian trait.

List the chi square value below. Round to three decimal places.

I need help to describe the answer of the above problem and explain the chi square analysis.