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I Really Don't Know

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Submitted By loriep
Words 6555
Pages 27
Chapter 14

Mendel and the Gene Idea
Lecture Outline
Overview


Every day we observe heritable variations (such as brown, green, or blue eyes) among individuals in a population.



These traits are transmitted from parents to offspring.



One possible explanation for heredity is a “blending” hypothesis.
° This hypothesis proposes that genetic material contributed by each parent mixes in a manner analogous to the way blue and yellow paints blend to make green.
° With blending inheritance, a freely mating population will eventually give rise to a uniform population of individuals.
° Everyday observations and the results of breeding experiments tell us that heritable traits do not blend to become uniform.



An alternative model, “particulate” inheritance, proposes that parents pass on discrete heritable units, genes, that retain their separate identities in offspring.
° Genes can be sorted and passed on, generation after generation, in undiluted form.



Modern genetics began in an abbey garden, where a monk named Gregor Mendel documented a particulate mechanism of inheritance.

A. Gregor Mendel’s Discoveries
1. Mendel brought an experimental and quantitative approach to genetics.


Mendel discovered the basic principles of heredity by breeding garden peas in carefully planned experiments.



Mendel grew up on a small farm in what is today the Czech Republic.



In 1843, Mendel entered an Augustinian monastery.



He studied at the University of Vienna from 1851 to 1853, where he was influenced by a physicist who encouraged experimentation and the application of mathematics to science and by a botanist who stimulated Mendel’s interest in the causes of variation in plants.



These influences came together in Mendel’s experiments.



After university, Mendel taught at the Brunn Modern School and

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