Question

In tomato plants, the allele for red fruit color (R) is dominant to the allele for yellow fruit color (r). The allele for round-shaped fruit (F) is dominant to the allele for pear-shaped fruit (f).
Two tomato plants, heterozygous for fruit color and fruit shape, are crossed. The Punnett square for this dihybrid cross is shown below.

Answer 1

Answer:

The cross between rrff and RrFF does not produce any F1 offspring with the genotype, Rrff, therefore the probability that the F1 offspring will have red pear shaped fruit (Rrff) is: c. 0%

Given the following:

• Allele for red fruit color - (R) - dominant
• Allele for yellow fruit color - (r) - recessive
• Allele for round shaped fruit (F) - dominant
• Allele for pear shaped fruit (f) - dominant

A tomato plant that has a yellow pear shaped fruit will be - rrff

A tomato plant that is a heterozygous red fruit and is h0m0zygous round shaped fruit will be: RrFF

The cross between both parents (rrff × RrFF) is shown in the Punnett Square attached below.

F1 offspring that will have red pear shaped fruit will have the genotype as, Rrff.

Thus, the cross between rrff and RrFF does not produce any F1 offspring with the genotype, Rrff, therefore the probability that the F1 offspring will have red pear shaped fruit (Rrff) is: c. 0%

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