In Tomatoes, the Alleles for a Gene Controlling Fruit Shape

Multiple Choice

In tomatoes, the alleles for a gene controlling fruit shape assort independently of the alleles of a gene controlling fruit colour. Round-shaped fruit are dominant to oval-shaped fruit and red fruit are dominant to yellow fruit. A homozygous, red, round-fruit tomato plant is crossed to a tomato plant with yellow oval fruit to produce an F₁ generation. The F₁ plants are crossed to pure-breeding red oval plants. The phenotypic ratio for the offspring of this second cross would be expected to be

A) 9 round red: 3 round yellow: 3 oval red: 1 oval yellow.
B) 1 round red: 1 round yellow: 1 oval red: 1 oval yellow.
C) 1 round red: 1 oval red.
D) 3 round red: 1 oval yellow.
E) 1 round red: 3 oval yellow.