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?

Question

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?, 9 : 3 : 3 : 1 ratio of phenotypes only, 9 : 3 : 3 : 1 ratio of genotypes only, 1 : 1 : 1 : 1 ratio of phenotypes only, 1 : 1 : 1 : 1 ratio of phenotypes and genotypes

MARKS App · Accepted Answer

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

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