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(C) In incomplete dominance, the dominant allele does not completely mask the effect of the recessive allele. In the case of $Mirabilis 	ext{ } jalap

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Incomplete dominance

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(C) In incomplete dominance, the dominant allele does not completely mask the effect of the recessive allele. In the case of $Mirabilis 	ext{ } jalapa$ (Four o'clock plant), when a red-flowered plant $(RR)$ is crossed with a white-flowered plant $(rr)$, the $F_1$ generation produces pink flowers $(Rr)$. When $F_1$ individuals are self-pollinated, the $F_2$ generation shows a phenotypic ratio of $1:2:1$ ($1$ Red : $2$ Pink : $1$ White). This $1:2:1$ ratio is characteristic of incomplete dominance.

In the $F_2$ generation, a $1:2:1$ ratio with pink flowers indicates the phenomenon of ....

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