Influence of Heredity and Environment

Overview

The heredity vs environment debate—often called "nature vs nurture"—is a foundational concept in Child Development and Pedagogy. For UTET, you must understand that **both heredity and environment interact continuously** to shape a child's physical, cognitive, social and emotional development. Neither acts alone.

This topic appears frequently in CDP sections across TET papers. Questions typically test whether you can identify which traits are primarily hereditary, which are environmental, and how teachers/families/communities influence development. Expect 2–4 questions requiring you to distinguish hereditary factors from environmental ones, or to identify the role of specific agents like school or family.

Master the key terms (genotype, phenotype, nature, nurture), know examples of each influence, and understand that **interaction**—not one factor dominating—is the modern consensus.

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Key Concepts

• **Heredity (Nature)**: The transmission of physical and certain psychological characteristics from parents to offspring through genes. Determines potential, not destiny.

• **Environment (Nurture)**: All external factors—family, school, peers, community, culture, nutrition, experiences—that influence development after conception.

• **Genotype vs Phenotype**: Genotype is the genetic code inherited; phenotype is the observable trait that results from genotype interacting with environment. Example: A child may inherit genes for tall height (genotype) but poor nutrition limits actual height (phenotype).

• **Interaction Principle**: Heredity sets the upper and lower limits of development; environment determines where within that range a child actually develops. Neither alone explains any complex trait.

• **Critical/Sensitive Periods**: Certain environmental influences have maximum impact during specific developmental windows (e.g., language acquisition is easiest before age 7).

• **Maturation**: Biologically-driven developmental changes that unfold according to a genetic timetable, relatively independent of environment (e.g., crawling before walking).

• **Learning**: Relatively permanent change in behaviour due to experience—primarily an environmental influence.

• **Co-twin Studies**: Research comparing identical twins raised together vs apart helps separate hereditary from environmental effects.

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Formulas / Key Facts

| Factor | Primarily Hereditary | Primarily Environmental | |--------|---------------------|------------------------| | Physical traits | Eye colour, blood group, skin colour, basic body structure | Height (partially), weight, physical fitness | | Intelligence | Basic intellectual potential (IQ has ~50% heritability) | Stimulation, education, nutrition affect actual IQ scores | | Temperament | Activity level, emotional reactivity | Expression and regulation shaped by parenting | | Language | Capacity for language acquisition | Specific language learned, vocabulary, fluency | | Personality | Some traits like introversion/extroversion have genetic basis | Values, attitudes, habits shaped by family and culture |