ANTA01H3 Lecture Notes - Sickle-Cell Disease, Acclimatization, Production Function
Document Summary
Natural selection-genes favouring survival become more frequent in population. Few contribute larger share of genes to next generation. = one species over wide geographic area. = genetics and environment reflected in phenotype and generate diversity. Biological plasticity-ability to respond physiologically to changes in environment. Developmental acclimatization-changes occur during growth in response to stress. Linear body loses heat faster than compact body. Colume same, surface area increases; hot climates=linear bodies ; cold climates=compact bodies. Relationship between protruding parts and temperature ; longer limbs=warm climates; shorter limbs=cold climates. Long limbs have more surface area for volume=greater heat loss. Nose-transform ambient air into warm humid air for lungs. More surface area to warm and humidify air breathing in, collect moisture breathing out. More surface area to dissipate heat and moisture. Dark skin=decrease risk of skin cancer ; and/or. Protects against folate breakdown (darker) and allows products of vitamin d (lighter) Global variation in uv levels determines balance between 2 factors.
