IUB BIOL-L 211 - Mendelian Genetics (3 pages)

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Mendelian Genetics



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Mendelian Genetics

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Lecture 2 Covers evolution of genetic theory


Lecture number:
2
Pages:
3
Type:
Lecture Note
School:
Indiana University, Bloomington
Course:
Biol-L 211 - Molecular Biology
Edition:
1
Documents in this Packet

Unformatted text preview:

BIOL L 211 Lecture 2 Outline of Last Lecture I New Life for Ancient DNA Article II Genetic Research III Purpose IV Procedure V Conclusion Outline of Current Lecture I Pangenesis II Lamarckism III Blending Theory of Inheritance IV The Arrival of Gregor Mendel Current Lecture Mendelian Genetics From the Greeks to Gregor Mendel I Pangenesis 600BC 1800s A Pangenesis was the original explanation of heredity provided by the Greeks B Theory Pangenes flow from all body parts to the reproductive system C Widely accepted theory clearly for a long time D Aristotle disputed this theory 1 He observed that if a man lost his arm in battle he still had normal children 2 Instead suggested that pangenes provided potential for a trait 3 He was closer to the truth than he may have guessed II Lamarckism A Theory put forth by Jean Baptiste Lamarck These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute B Suggested that traits developed over a lifetime could be passed on to offspring C In 1893 August Weismann proved that organisms do not necessarily pass on acquired characteristics 1 Weismann performed an experiment on mice cutting off their tails 2 He followed the mice for generations yet none of the offspring developed tails 3 Thus developed Germ Plasm Theory Theory that only germ sperm egg cells possess hereditary information III Blending Theory of Inheritance A Theory of the 19th Century B Suggested that offspring could inherit traits within the constraints of the parents traits C Problem If this were true ultimately all traits would converge to one eliminating diversity which is not the case IV The Arrival of Gregor Mendel A Performed his famous Pea Experiments discovering the fundamental laws of inheritance B Quick overview of Mendelian Genetics 1 Gene segment of DNA that controls a trait 2 Allele specific version of a gene 3 Locus location of a gene on a chromosome 4 Phenotype physical



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