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1. Co-dominance – These are the alleles that are able to express themselves independently when found together in a heterozygote. They are termed as co-dominant alleles.
2. Incomplete dominance – it is the phenomenon of inheritance where none of the contrasting characters in a pair are dominant. In the F1 hybrid, the expression of the trait is a fine mixture of the expression of the two factors. For instance, the Mirabilis jalapa produces pink flowers when a hybrid cross between a red and white flower is carried out.