Class 12 · Principles of Inheritance and Variation

Heredity and Species Constancy — NEET Biology

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Have you ever wondered why an elephant always gives birth only to a baby elephant and not some other animal? Or why a mango seed forms only a mango plant and not any other plant?

NCERT Biology · Class 12 · Chapter 4 · Paragraph 7
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Which of the following statements regarding the characteristics of polygenic inheritance are NOT correct? S1: Polygenic traits always show distinct alternate forms, unlike Mendelian traits. S2: The expression of polygenic traits is often significantly influenced by environmental factors. S3: The phenotypes of polygenic traits are typically distributed as a bell-shaped curve in a population. S4: Alleles involved in polygenic inheritance often have a cumulative or additive effect on the phenotype. S5: A single gene with multiple phenotypic expressions is an example of polygenic inheritance.

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