In a testcross involving tomatoes, one tomato plant has the genotype O/o ; R/r. The genotype of the other plant is
A) o/o; r/r.
B) O/o; R/r.
C) O/O; R/R.
D) O/O; r/r.
E) o/o; R/R.

Question

Quizplus · Accepted Answer

A testcross involves crossing an individual with a homozygous recessive individual to determine the genotype of the first individual. The correct choice is o/o; r/r, which is homozygous recessive for both traits.

In a Testcross Involving Tomatoes, One Tomato Plant Has the Genotype