Tomato Plants 

In tomato plants, round fruit (R) is dominant to oval fruit (r). Pure breeding plants with red and round fruit (FFRR) were crossed to pure breeding plants with yellow and oval fruit (ffrr).

The red and round F₁ progeny were then testcrossed to plants that were homozygous recessive for both genes (ffrr) with the following results:

Phenotypes

Number of Offspring

Red and round

2 255

Red and oval

290

Yellow and round

310

Yellow and oval

2 145 

Use a Punnett square to determine the expected testcross progeny on the basis of Mendel's Law of Independent Assortment.

a. Record the phenotypes and the phenotype ratio in lowest terms.