Introduction – Mendelian inheritance
Introduction ? Mendelian inheritance
Genetics 371B Lecture 1
27 Sept. 1999
The mechanism of inheritance... Some early hypotheses:
Predetermination e.g., the homunculus theory
Blending of traits
Introducing a more systematic approach... Gregor Mendel (1822?1884) and his experiments with garden pea
But first: Choosing a model organism
What is it?
Why bother?
Features of a good model organism: Some commonly used model organisms:
Mendel's organism of choice: garden pea His question: If a pair of plant lines showing a clear character difference are crossed, will the progeny show an intermediate phenotype?
He established true-breeding lines...
...that showed character differences
Made crosses (matings) between each pair of lines Example: Character: Phenotypes:
x
"F1" F1 x F1
"F2"
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