Chapter 11 Observable Patterns of Inheritance

Chapter 11 Observable Patterns of Inheritance - Chapter 11...

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Chapter 11 Observable Patterns of Inheritance I. Sickled Cells and Garden Peas A. Gregor Mendel observed patterns of inheritance in peas that provided clues about what the genes were doing. B. Sickle-cell anemia is a genetic disease in which an altered gene leads to many health difficulties. II. Mendel’s Insights Into the Patterns of Inheritance A. Introduction 1. By the late nineteenth century, natural selection suggested that a population could evolve if members showed variation in heritable traits. Variations that improved survival chances would be more common in each generation—in time, the population would change or evolve. 2. The theory of natural selection did not fit with the prevailing view of inheritance— blending. a. Blending would produce uniform populations—such populations could not evolve. b. Many observations did not fit blending—for example, a white horse and a black horse did not produce only gray offspring. 3. Gregor Mendel used experiments in plant breeding and a knowledge of mathematics to form his hypotheses. B. Mendel’s Experimental Approach 1. Mendel used the garden pea in his experiments. a. This plant can fertilize itself; true-breeding varieties were available to Mendel. b. Peas can also be cross-fertilized by human manipulation of the pollen. 2. Mendel cross-fertilized true-breeding garden pea plants having clearly contrasting traits (example: white vs. purple flowers). C. Some Terms Used in Genetics 1. Genes are instructions for producing a trait. 2. Each gene has a locus on a chromosome.
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Chapter 11 Observable Patterns of Inheritance - Chapter 11...

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