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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. Identify the outcome of this particular cross when a plant with genotype YyRr is back-crossed with the double recessive parent?

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9 : 3 : 3 : 1 ratio of genotypes only

9 : 3 : 3 : 1 ratio of phenotypes only

1 : 1 : 1 : 1 ratio of phenotypes and genotypes.

1 : 1 : 1 : 1 ratio of phenotypes only

answer is D.

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Detailed Solution

When a double heterozygous individual is test crossed with recessive parent, the phenotypic as well as genotypic ratio is 1: 1 : 1: 1. The genotypes are RrYy, rryy, Yy rr and yy Rr.

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