Principle of Inheritance and VariationEasyBloom L3

Question

Originally, genetic inheritance was thought to be a function of the blending of traits from the two parents. Which exception to Mendel's rules is an example of blending?

Options

A.Polygenic inheritance
B.Incomplete dominance
C.Codominance
D.Pleiotropism

Solution

Sol.(b) [Key Concept: Incomplete Dominance — Blending Analogy] Incomplete dominance produces an intermediate phenotype (blend of parental phenotypes) in F1 — for example, crossing red-flowered (RR) with white-flowered (rr) gives pink-flowered (Rr) F1. This RESEMBLES blending inheritance at first glance. However, it is NOT true blending because in F2, parental types (red and white) reappear (1:2:1 ratio). Codominance is not blending — both alleles are fully expressed. Polygenic inheritance produces a range of phenotypes but is due to multiple genes.

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