Lecture2_1-13-10

Lecture2_1-13-10 - Heredity before Mendel One idea is...

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Heredity before Mendel One idea is Preformationism There is a preformed mini-person ( homunculus ) inside an egg or a sperm. Problem: 1. Only one parent contributes to the offspring. 2. A homunculus within a homunculus?
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Pangenesis Pangenesis : “particles” carrying information from various parts to the reproductive organ. Inheritance of acquired characteristics. Lamarckism: Use and Disuse.
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Blended Inheritance parental traits are mixed and become forever changed in the offspring. problematic for the theory of evolution.
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Gregor Mendel and Garden Pea Gregor Mendel (1822-1884) Augustinian monk Pisum sativa (Garden pea)
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Model Organisms Ease of cultivation, Rapid Reproduction, Small size, Fecund (large brood size), Mutants are available and easy to identify, Broad literature and experimental background available.
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Monohybrid Cross Mating between individuals that differ in only one trait, yellow pea x green pea, violet flower x white flower tall x dwarf round seed x wrinkled seed full pod x constricted pod etc.
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Autosomal Inheritance Purple Flower X White Flower + P Purple Flower F 1
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Autosomal Inheritance Purple Flower X White Flower + P Purple Flower F 1
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1) Mendel’s monohybrid crosses were not sex dependent. It did not matter whether, say, a purple male plant pollinated a white female plant, or vice versa. The results were the same either way. This is called a reciprocal cross. 2) Mendel was dealing with autosomal
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This note was uploaded on 02/09/2010 for the course BIOL 241 taught by Professor Henrychang during the Spring '10 term at Purdue.

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Lecture2_1-13-10 - Heredity before Mendel One idea is...

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