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(B) In pea plants,yellow seed color $(Y)$ is dominant over green seed color $(y)$.Let the genotype of the unknown yellow seed be $Y?$.The green seed m

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Heterozygous yellow

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(B) In pea plants,yellow seed color $(Y)$ is dominant over green seed color $(y)$.Let the genotype of the unknown yellow seed be $Y?$.The green seed must have the genotype $yy$ because green is the recessive trait.The cross is $Y? 	imes yy$.If the unknown seed were homozygous yellow $(YY)$,the offspring would all be yellow $(Yy)$.Since the offspring are $50\%$ yellow $(Yy)$ and $50\%$ green $(yy)$,the unknown yellow seed must be heterozygous $(Yy)$.The cross is $Yy 	imes yy ightarrow 1 Yy : 1 yy$.

$A$ test cross of an unknown yellow seed with a green seed produces $50\%$ green seeds and $50\%$ yellow seeds. What is the genotype of the unknown yellow seed?

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