Homework SourseTwo whitefruited squash plants when crossed with each other
Two white-fruited squash plants, when crossed with each other, produce about
three-fourths white and one-fourth yellow offspring.
a. What are the genotypes of these two parents?
b. What will each produce if crossed with a yellow-fruited plant?
three-fourths white and one-fourth yellow offspring.
a. What are the genotypes of these two parents?
b. What will each produce if crossed with a yellow-fruited plant?
Solution
a. As the gene for white-colored is dominant over yellow-colored fruit, if each of the white-fruited squash plants is Wy (White dominant, yellow recessive), then 1/4 of the children are WW, 1/2 are Wy, and 1/4 are yy This means that 3/4 of the offspring are white (the WW and Wy) and 1/4 are yellow, which is what we are asked to produce. b. Then, if each of these Wy parents is crossed with a yellow-fruited plant, which is yy, Then, one child will be Wy and one child will be yy from each parent. Thus, each parent produces 1/2 white and 1/2 yellow offspring.
