ANTH 100A Lecture Notes - Lecture 52: Acclimatization, Balancing Selection, Red Blood Cell
Document Summary
The body also deals with stresses through acclimatization. This is a response on the individual level, often reversible. Increase in red blood cell count at high altitudes. Can cause phenotypic differences between genetically similar groups. General relationship between body size and temperature. General relationship between limb proportions and temperature. A trait may become common or rare in a population due to chance. Such effects are referred to as genetic drift. Genetic drift contributes to differences between populations. Part of a breeding population branches off as a new population (ex. colony) Rare traits may be absent from or overrepresented in new population. Result may be group of related but different populations in a region. Part of a breeding population dies in a catastrophe. By chance, most individuals with a trait may die or survive. Population now has a different proportion of that trait than before the catastrophe. Individuals with most attractive traits mate more often.
