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  4. In a certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes. Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent ?

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Q. In a certain plant, yellow fruit colour $(Y)$ is dominant to green fruit colour $(y)$ and round shape $(R)$ is dominant to oval shape $(r)$. The two genes involved are located on different chromosomes.
Which of the following is correct for the condition when plant $YyRr$ is back crossed with the double recessive parent ?

Principles of Inheritance and Variation

Solution:

When $YyRr$ is crossed with double recessive parent then genotypic and phenotypic ratio will be $1 : 1 : 1 : 1$.
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Phenotypic ratio $= 1$ yellow round : $1$ yellow oval : $1$ green round : $1$ green and oval. This represents a test cross.