Home Biology Principles of Inheritance and Variation In a certain plant, yellow fruit colour (Y) …
Biology Principles of Inheritance and Variation Single Correct MCQ
Published on: August 20, 2026

In a certain plant, yellow fruit colour (Y) is dominant to green (y) and round shape (R) is dominant to oval (r). The two genes involved are located on different chromosomes. Which of the above will result when plant YyRr is backcrossed (testcrossed) with the double recessive parent?

A
9:3:3:1 ratio of phenotypes only
B
9:3:3:1 ratio of genotypes only
C
1:1:1:1 ratio of phenotypes only
D
1:1:1:1 ratio of phenotypes and genotypes

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