Problem Set 2

Problem Set 2 - Katherine Nguyen Tuesday Section at 6:00...

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Katherine Nguyen Tuesday Section at 6:00 p.m. Anthropology 005 Introduction to Physical Anthropology Problem Set # 2: Mendelian Genetics 1. To be subject to evolution by natural selection a trait must be transmitted reliably from parent to offspring. A. In Darwin’s day, people believed in a “fluid” or “blending” model of heredity. Why would such a system not support evolution by natural selection? Blending does not support evolution by natural selection because with blending inheritance, there could be little or no variation to act on. Jenkin’s example of blending a tall and short parent to produce an intermediate offspring proves why this argument is compelling. B. How does the behavior of Mendelian genes differ from this blending model? Unlike the blending model, Mendelian genetics accounts for the preservation of variation. Through his experiments, Mendel concluded two important things. The observed characteristics of organisms are determined jointly by two particles, one inherited from the mother and one from the father. Also, Each of these two particles, or genes, is equally likely to be transmitted when gametes are formed (independent assortment). 2. Genes are organized, not just randomly arranged, in the cell nucleus.
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This note was uploaded on 04/29/2008 for the course ANTH 5 taught by Professor Gaulin during the Spring '07 term at UCSB.

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Problem Set 2 - Katherine Nguyen Tuesday Section at 6:00...

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