ANTH 1301 Lecture 9: Lecture 9
19 Oct 2015
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Document Summary
Relationship between genes and biological effects: single gene effect: each gene has a distinct biological effect, polygenic trait: several genes contribute to a single effect. Microevolution: small changes in the population which occur over the period of a few thousand years. Macroevolution: large scale complex evolutionary changes in whole systems (brain size, pelvis form, development of tool making) over the period of many thousands or hundreds of thousands of years. Four groups of similar hox genes, shown in color, appear to control related regions of the human body and the fly. Biological adaptation- genetic changes within a population in response to selective pressures which are usually environmentally induced. long term. form of macroevolutionary change. Ex: those who have lived there for 5000+ years and biologically adapted to the climate. Acclimatization- a physiological response within individuals to environmental pressure or stress. Acclimate to the environment. ex: football team go to colorado early to practice in high altitude.
