The phenotypic ratio obtained by crossing Mendel’s $F_{1}$ dihybrid with the recessive parent is

9:3:3:1

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3:1

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1:1:1:1

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9:7

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Solution

The correct option is C
1:1:1:1

The genotype of $F_{1}$ dihybrid is YyRr and it produces 4 types of gametes, YR, Yr, yR, yr. The recessive parent produces only one type of gamete (yr). Thus the progeny exhibit 4 different genotypes and phenotypes in equal proportions, making it a ratio of 1:1:1:1, YyRr, Yyrr, yyRr, yyrr respectively.

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