Question

The fruit of summer squash can be sphere shaped, disk shaped, or elongate, depending on the genotype of the plant. Two varieties with spherical fruit (both true-breeding) were crossed and yielded F1 plants with disk shaped fruit. Among 455 plants in the F2 generation, the following fruit phenotypes were observed: 248 disk, 179 sphere, 28 elongate. The elongate plants were true breeding. a.) Propose a genetic model to explain these observations b.) If all the F2 plants with spherical fruit were crossed with the F2 plants with elongate fruit, what result among the progeny would support the model you proposed?

Answer 1