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(D) : The inheritance of flower colour in the dog flower (snapdragon or Antirrhinum $sp.$) is a good example which shows incomplete dominance.In a cro

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monohybrid cross with incomplete dominance

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(D) : The inheritance of flower colour in the dog flower (snapdragon or Antirrhinum $sp.$) is a good example which shows incomplete dominance.In a cross between true-breeding red-flowered $(RR)$ and true-breeding white-flowered plants $(rr)$,the $F_1$ $(Rr)$ was pink.When the $F_1$ was self-pollinated,the $F_2$ resulted in the following ratio: $1$ $(RR)$ Red : $2$ $(Rr)$ Pink : $1$ $(rr)$ White.Here,the genotype ratios were $1 : 2 : 1$,as in any Mendelian monohybrid cross,but the phenotype ratios had changed from the $3 : 1$ dominant:recessive ratio to $1 : 2 : 1$.

$F_2$ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as $1 : 2 : 1$. It represents a case of

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