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Read Additive Genes and Continuous Traits
Several genes with additive effects can create a continuous range of phenotypes.
NSEB · Principles of Inheritance and Variation · 1 linked question · 100% coverage
Know this first
Polygenic Inheritance is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Study deeper: NCERT Biology · Principles of Inheritance and Variation
Explain the gradient
Human skin colour reflects additive effects of multiple genes, often modified by environment. Many allele combinations produce a continuum rather than a few discrete classes.
OlympIQ exam lens
- ✓Polygenic traits involve multiple genes.
- ✓Additive effects can create continuous variation.
- ✓Environment can modify phenotype.
OlympIQ trap
Continuous variation is not evidence for a single dominant/recessive pair.
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