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(A) In a dihybrid cross,the genotype of a double heterozygous plant is $TtYy$.When this plant is selfed $(TtYy 	imes TtYy)$,the phenotypic ratio of t

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$\frac{1}{16}$

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(A) In a dihybrid cross,the genotype of a double heterozygous plant is $TtYy$.When this plant is selfed $(TtYy 	imes TtYy)$,the phenotypic ratio of the offspring follows Mendel's Law of Independent Assortment.The trait for height is tall $(T)$ dominant over dwarf $(t)$,and yellow cotyledon $(Y)$ is dominant over green $(y)$.The probability of obtaining a dwarf plant $(tt)$ is $\frac{1}{4}$.The probability of obtaining a green cotyledon plant $(yy)$ is $\frac{1}{4}$.Since these traits assort independently,the probability of obtaining a dwarf plant with green cotyledon $(ttyy)$ is $\frac{1}{4} 	imes \frac{1}{4} = \frac{1}{16}$.

$A$ double heterozygous tall plant with yellow cotyledon colour is selfed. What is the ratio of dwarf plants with green cotyledon in the offspring?

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