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Question: Complete dominance does not occur in (A) Mirabilis jalapa (B) Oenothera lamarckiana (C) Lathyr...

Complete dominance does not occur in
(A) Mirabilis jalapa
(B) Oenothera lamarckiana
(C) Lathyrus odoratus
(D) All of the above

Explanation

Solution

Complete dominance is a type of dominance, observed in the heterozygous conditions, in which the dominant allele entirely masks the activities of the recessive allele. Complete dominance can be possibly observed in the plants like Mirabilis jalapa, Oenothera lamarckiana, Lathyrus odoratus and others.

Complete answer:
A trait is usually signified by two distinct features of a gene present in heterozygous organisms. The allele or factor which could express itself within the heterozygous organism is referred to as a dominant trait and the other factor, which could not express its features and is suppressed by the dominant factors, is called a recessive factor. Moreover, dominant phenotype is observed in the organisms if they exhibit complete dominance. However, if the dominance is not found competing and is incomplete, then in that case it is termed as incomplete dominance. According to the Law of incomplete dominance, if neither of any factors of a gene shows dominance, then in that case the phenotype of the heterozygous dominant individual is the combination of both recessive as well as dominant traits. In such cases, the dominant allele or factor is not fully expressed. Moreover, in case of incomplete dominance the dominant allele, or factor of a gene, does not entirely mask the effect of a recessive factor or allele, and as a result of this the organism uses to exert physical conditions owing as a mixture of both the factors and alleles.

Note: Apart from this, another type of dominance is noticed in which the factors of a gene (pairs) present in a heterozygous organism are completely expressed. This type of dominance is called codominance.