Lecture_1_-_Intro_to_Agricultural_Genetics-1

Lecture_1_-_Intro_to_Agricultural_Genetics-1 - Lecture 1...

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Lecture 1 Lecture 1 Introduction to Agricultural Introduction to Agricultural Genetics Genetics
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History of Genetics History of Genetics 1st Species Domesticated – 7,000 to 10,000 years ago People soon discovered desirable and undesirable traits were passed from one generation to the next. Selective breeding probably began soon after Examples of Ancient Selective Breeding: Nomadic Tribes of Middle East developed Arabian horses at least 3,000 to 5,000 years ago Cultivation of Plants have been traced back to at least 15,000 years ago Discovery of ancient maize plants in Mexico Discovery of ancient date palm varieties in Babylonia
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History of Genetics History of Genetics Ancient Greece (500-300 BC) Hippocrates and Aristotle wrote essays on how traits were carried in the male ‘seed’ and produced offspring with similar characteristics Ancient Rome (300 BC -500 AD) Plant Grafting and Animal Breeding were common in Roman society. The Romans produced many improved plant varieties and animal breeds. Middle Ages From 300 BC to 1600 AD the theoretical understanding of genetics was not extended by new or significant ideas. However, by the Middle Ages, naturalists well aware of the impact of heredity on organisms they studied.
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History of Genetics History of Genetics An English anatomist named William Harvey wrote a paper in the early 1600’s on reproduction and development patterned after Aristotle’s work. He expounded on the theory of epigenesis Epigenesis states that structures such as body organs are not initially present in the early embryo but are formed during embryonic development. This contrasts directly with the theory of preformation , also first put forward in the early 1600’s. Preformation states that each male sex cell contains a complete miniature adult, called a homunculus (latin for “little man”) which contains all the organs and body parts of a
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This note was uploaded on 05/07/2011 for the course DARY 2072 taught by Professor Hay during the Spring '09 term at LSU.

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Lecture_1_-_Intro_to_Agricultural_Genetics-1 - Lecture 1...

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