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The ratio in a dihybrid test cross between two individuals is given by
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$1: 1: 1: 1$.
Test cross is a cross to know the genotype of the individual. The individual is crossed with recessive parent. The dihybrid test cross ratio is $1: 1: 1: 1$. The characters under consideration are tall white and dwarf black.
Gametes of $\mathrm{TtWw}=\mathrm{TW}, \mathrm{Tw}, \mathrm{tW}, \mathrm{tw}$
Gametes of ttww $=\mathrm{tw}$
Thus the ratio of $\mathrm{TtWw}:$ Ttww $: \mathrm{ttWw}:$ ttww is $1: 1: 1: 1$.
Gametes of $\mathrm{TtWw}=\mathrm{TW}, \mathrm{Tw}, \mathrm{tW}, \mathrm{tw}$
Gametes of ttww $=\mathrm{tw}$
Thus the ratio of $\mathrm{TtWw}:$ Ttww $: \mathrm{ttWw}:$ ttww is $1: 1: 1: 1$.
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