Incomplete dominance is shown by A) LilyB) MirabilisC) Helianthus D) China rose

The correct answer is B) Mirabilis.
Incomplete dominance is a type of genetic inheritance where the phenotype of the heterozygote (individual with two different alleles) is an intermediate blend between the phenotypes of the two homozygotes (individuals with two identical alleles). In incomplete dominance, neither allele is completely dominant over the other, leading to a mixed or intermediate phenotype in the heterozygous condition.
Example: Mirabilis jalapa (Four O'Clock plant)
• Mirabilis (commonly known as Four O'Clock plant) exhibits incomplete dominance in flower color inheritance.
o When a red-flowered plant (RR) is crossed with a white-flowered plant (WW), the offspring (heterozygotes, RW) have pink flowers. This is a clear example of incomplete dominance, where neither red nor white is fully dominant, and the result is an intermediate pink color.
Why Not the Other Options?
1. A) Lily:
o Lily flowers do not typically exhibit incomplete dominance. They usually follow classical Mendelian inheritance patterns with complete dominance.
2. C) Helianthus (Sunflower):
o Helianthus (sunflowers) typically follows complete dominance inheritance rather than incomplete dominance.
3. D) China Rose:
o China rose (Hibiscus rosa-sinensis) also follows a different inheritance pattern, typically showing complete dominance, rather than incomplete dominance.
Mirabilis jalapa (Four O'Clock plant) is a well-known example of a plant that exhibits incomplete dominance, making the correct answer B) Mirabilis.