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(B) test cross is a cross between an individual with a dominant phenotype (but unknown genotype) and a homozygous recessive individual. In a dihybrid

Vedclass · Accepted Answer

$YyRr 	imes yyrr$

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(B) test cross is a cross between an individual with a dominant phenotype (but unknown genotype) and a homozygous recessive individual. In a dihybrid test cross,an individual heterozygous for two traits $(YyRr)$ is crossed with a homozygous recessive individual $(yyrr)$. The gametes produced by $YyRr$ are $YR, Yr, yR,$ and $yr$. The gametes produced by $yyrr$ are only $yr$. The resulting progeny are $YyRr$ (Yellow Round),$Yyrr$ (Yellow wrinkled),$yyRr$ (Green round),and $yyrr$ (Green wrinkled) in a $1:1:1:1$ ratio. Therefore,the cross $YyRr 	imes yyrr$ results in a $1:1:1:1$ phenotypic ratio.

Which one of the following crosses will have a $1:1:1:1$ ratio of progeny?

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