(B) The correct answer is $B$ $(1:2:1)$.In incomplete dominance,the phenotypic and genotypic ratios are identical.For a cross between two heterozygous

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(B) The correct answer is $B$ $(1:2:1)$.In incomplete dominance,the phenotypic and genotypic ratios are identical.For a cross between two heterozygous individuals (e.g.,$Rr \times Rr$),the resulting offspring follow the ratio $1$ (homozygous dominant) : $2$ (heterozygous) : $1$ (homozygous recessive).Thus,the genotypic ratio is $1:2:1$.