A) dominance
B) codominance
C) incomplete dominance
D) segregation
Correct Answer: C
Solution :
The genotypic and phenotypic ratio of 1 : 2 : 1 with red, pink and white flowers are produced in Mirabilis jalapa, when red flowered-plants (FIR) are crossed with white flowered (rr). It occurs due to allelic gene interactions, called, incomplete dominance, in which both of the allelomorphic genes will have partial or incomplete dominance and \[{{\text{F}}_{\text{1}}}\]hybrid will show mixture of characters of two parents. In Dominance or complete dominance, one allelomorph will show complete dominance over the other which is recessive e.g., Mendel's monohybrid and dihybrid experiments. In Codominance, both dominant and recessive alleles lack their dominant and recessive relationships and both genes express themselves independently i.e., without mixing. e.g., A cross between red coat colour variety with white variety leads to the formation of new variety with reddish grey colour or roan colour coat. Segregation is the separation of allelomorphic (allelic) genes into different gametes at meiosis or the separation of traits in the offsprings, which are combined in a hybrid. Mendels first law is the law of segregation, based on monohybrid experiments.
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