In tomatoes, tall is dominant to dwarf, and smooth fruits are dominant to hairy fruits.A plant that is homozygous for both dominant traits is crossed with a plant that is homozygous for both recessive traits.Crosses of the F₁ progeny yield the following results: 78 tall smooth fruits, 82 dwarf hairy fruits, 22 tall hairy fruits, and 18 dwarf smooth fruits.These data indicate that the genes are A) on different chromosomes. B) linked, but do not cross over. C) linked and show 10 percent recombination. D) linked and show 20 percent recombination. E) linked and show 40 percent recombination.

Question

Quizplus · Accepted Answer

The observed numbers of offspring do not match those expected from independent assortment of the two traits, suggesting that they are linked. The frequency of recombinant offspring (22 tall hairy fruits + 18 dwarf smooth fruits) out of the total number of offspring (78+82+22+18=200) is (22+18)/200 = 20/200 = 0.1, or 10 percent. Therefore, the genes are linked and show 20 percent recombination.

In Tomatoes, Tall Is Dominant to Dwarf, and Smooth Fruits