HLTC23H3 Lecture 4: HLTB02 lecture 4.docx
Document Summary
Variation in human growth and development (human beings are very diverse, height, physiological growth, between ethnic groups, within ethnic groups, etc), variations start in childhood. Humans are 99. 9% genetically identical at dna sequence level (0. 1% different) Phenotype: expression of gene and environment (physical attributes), eg light vs dark skin (evo selection for light skin in less sunlight, better intake of vitamin d; evo selection for dark skin in more sunlight, less likely to get sunburned) Body types: short/stalky-adaptive to cold temperature (more fat for warmth), long/lean-adaptive to hot temperature (give off heat more, less fat insulation, more sweat) Comparative growth: (normal v. abnormal) skeletal measures, dental, body composition, sexual maturation. Intergenerational effect hypothesis (affects health and development)-health and development of child/health is a reflection of health of mothers, history of. Secular trends in growth and development (height/stature)-change of size/shape of body over time between/within population (eg. migration, improvement in nutrition)
