A self-pollinating plant with orange flowers and alternating leaf arrangement produces
Plants with red flowers and alternating leave- 47
Pants with orange flowers and alternating leaves- 103
Plants with yellow flowers and alternating leaves- 51
The allele for yellow flower colour is

Recessive

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Dominant

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Incompletely dominant

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Incompletely recessive

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Codominant

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Solution

The correct option is D Incompletely dominant
The ratio of given offspring is 47: 103: 51 = 1: 2: 1. As we know that monohybrid cross with completely dominant trait gives 3: 1 phenotypic ratio in $F_{2}$ generation but here the phenotypic ratio is 1: 2: 1. This is because the heterozygous genotypes are not showing the dominant trait but they are a blend of the dominant and recessive phenotype. The plant heterozygous for flower colour (Rr) exhibit orange genotype while those with homozygous recessive (rr) exhibit red flowers and the homozygous dominant (RR) give yellow flowers. Yellow flower allele is incompletely dominant over red flower allele.
Therefore, the correct answer is option C.

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A self-pollinating plant with orange flowers and alternating leaf arrangement produces
Plants with red flowers and alternating leave- 47
Pants with orange flowers and alternating leaves- 103
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The allele for yellow flower colour is