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(B) In a standard monohybrid cross with complete dominance,the phenotypic ratio is $3:1$ and the genotypic ratio is $1:2:1$. However,in cases of incom

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Monohybrid cross with incomplete dominance

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(B) In a standard monohybrid cross with complete dominance,the phenotypic ratio is $3:1$ and the genotypic ratio is $1:2:1$. However,in cases of incomplete dominance (e.g.,flower color in $Antirrhinum$ $majus$ or snapdragon),the dominant allele does not completely mask the recessive allele. As a result,the heterozygote shows an intermediate phenotype. In the $F_2$ generation of such a cross,the phenotypic ratio becomes $1:2:1$ (one homozygous dominant,two heterozygous intermediate,and one homozygous recessive),which is identical to the genotypic ratio.

In a Mendelian cross,the genotypic and phenotypic ratios are identical in the $F_2$ generation. The ratio $1:2:1$ represents which of the following cases?

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