BICD 100 Lecture Notes - Lecture 3: Gregor Mendel, Pangenesis, Plant Breeding
2 Oct 2016
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In the previous question (lecture 2), one of the phenotypes will eventually disappear because it is in a small, isolated population, so genetic drift is likely to occur. Principals of natural selection: variation within trait, variation heritable. Natural selection not initially accepted because no known mechanism for creation of novel variation and no known mechanism for inheritance of traits. Thomas morgan: genes located on chromosomes and slight changes cause mutations. Pangenesis was early explanation for inheritance: characteristics acquired could be transferred. Gregor mendel: principles of inheritance via pea plants: certain traits were either-or when inherited. Central dogma and molecular biology: dna -> rna -> proteins through transcription and translation. Dna: discovered the genes were in dna 1944. Added enzyme to degrade each one individually and found the dna degradation caused no genetic material to be expressed. Dna: a t g c, phosphoric acid, 2" deoxyribose sugar.
