SECTION 2

SECTION 2 - Cory Baker Perm #: 3851763 Section 448 10-13-09...

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Cory Baker Perm #: 3851763 Section 448 10-13-09 Anthropology 5 Fall 2009 Problem Set # 2 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? In Darwin’s day, people believed in a “fluid” or “blending” model of heredity. This type of system would not support evolution by natural selection because blending inheritance states that hereditary material of the mother and father was thought to combine irreversibly in the offspring. However, with this theory of “blending inheritance”, there could be little or no variation available for selection to act on. Therefore, this theory would not support evolution by natural selection. B. How does the behavior of Mendelian genes differ from this blending model? (hint: what evidence shows that they do not blend?) The behavior of Mendelian genes differs from this blending model because genes reside on chromosomes, because individuals inherit one copy of each chromosome from each parent. Observed characteristics are determined by genes from both parents and mitosis transmits a copy of both chromosomes to every daughter cell, so every cell contains copies of both the maternal and the paternal chromosomes. Mendel also proposed the idea that one gene is inherited from each parent and that each of these genes is equally
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SECTION 2 - Cory Baker Perm #: 3851763 Section 448 10-13-09...

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