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Antirrhinum
Antirrhinum, commonly known as snapdragon, exhibits incomplete dominance. In incomplete dominance, the heterozygous genotype results in a phenotype that is a blend of the two homozygous phenotypes.
Explanation:
Incomplete dominance can be observed in Antirrhinum when a red-flowered plant (RR) is crossed with a white-flowered plant (WW). The resulting offspring with the genotype RW will have pink flowers, which is a blend of the red and white colors.
Example:
- RR (red) x WW (white) → RW (pink)
Phenotypic Ratio:
When two plants with incomplete dominance are crossed, the phenotypic ratio in the offspring will be 1:2:1. This means that there will be one red-flowered plant, two pink-flowered plants, and one white-flowered plant in the offspring.
Genotypic Ratio:
The genotypic ratio in this case will be 1:2:1 as well, with one RR (red), two RW (pink), and one WW (white) plants.
Conclusion:
Antirrhinum is a classic example of incomplete dominance, where the heterozygous genotype results in an intermediate phenotype. This genetic phenomenon is important in understanding the inheritance patterns of traits in organisms.