Question

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

• A. $1:1$ and $1:1:1:1$
• B. $1:1:1:1:1:1:1:1$ and $1:1:1:1$
• C. $1:1:1:1$ and $1:1$
• D. $1:1:1:1$ and $1:1:1:1:1:1:1:1$

Answer 1

Answer: (D)

$1:1:1:1$ 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- $RrYy\times rryy$

for Trihybrid test cross- $yyrrtt\times YyRyTt$