Suppose a researcher performed an experiment to determine the number of genes affecting fruit size in tomatoes. She crossed a domesticated, heirloom tomato plant with a wild tomato plant for two generations to obtain F2 individuals. In the parental lines, the domesticated tomatoes had a fruit diameter of 17 cm and the wild tomatoes had a fruit diameter of 5 cm.
If fruit size is an additive genetic trait, what number of genes should we expect to contribute to this phenotype? Use the data below. Your answer should be expressed numerically (no words).
Number of individual plants
The relative fitness of the A1A1 genotype is 1.0, the relative fitness of the A1A2 genotype is 0.8, and the relative fitness of the A2A2 genotype is 0.6. The A1 allele should ["stay the same", "increase", "decrease"] in the next generation, and it is likely ["incompletely dominant", "completely dominant"] with respect to the A2 allele.
Get Answers For Free
Most questions answered within 1 hours.