A typical dihybrid and trihybrid test-cross ratio are respectively:

1 : 1

and

1 : 1 : 1 : 1

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1 : 1 : 1 : 1 : 1 : 1 : 1 : 1

and

1 : 1 : 1 : 1

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1 : 1 : 1 : 1

and

1 : 1

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1 : 1 : 1 : 1

and

1 : 1 : 1 : 1 : 1 : 1 : 1 : 1

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Solution

The correct option is A $1 : 1 : 1 : 1$ and $1 : 1 : 1 : 1 : 1 : 1 : 1 : 1$
Dihybrid Test ratio: $1 : 1 : 1 : 1$
Trihybrid Test ratio : $1 : 1 : 1 : 1 : 1 : 1 : 1 : 1$
Test cross $\Rightarrow F_{1}$ generation $X$ recessive parent
for dihybrid test cross- $R r Y y \times r r y y$
for Trihybrid test cross- $y y r r t t \times Y y R y T t$

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