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I.9.7 Bio-cultural Adaptations – Genetic and Non- genetic factors.

Genetic factors

Bergman’s rule : Stockier body type in colder climates
Allen’s rule:
1) Shorter limbs in colder climates—low surface area leads to body mass retaining heat
2) Longer limbs in warmer climates—high surface area: body mass loses heat

Glogger’s Rule: People living in hot & damp places tend to have very dark skin

Normal Hemoglobin, Abnormal hemoglobin variants: Hbs and HbE, Balanced polymorphisms

Non genetic factors

Cultural factors- Habit and habitat

  1. housing
  2. clothing
  3. diet

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