2-6-09 - 1990 frequency of carbonaria only 30 The Clean Air...

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2-6-08 - 1990: frequency of carbonaria only 30% The Clean Air Acts - Variation was already present in the population Natural Selection operates on Existing variation - An individual cannot develop a new trait because a need suddenly arises - Traits(phenotypes) selected for already are present in the population - On variation o “As you travel through this life, friend, Whatever be your goad- Keep your eye upon the variance and not upon the mode!” Natural Selection operates on individual phenotypes - Evolution operates on populations (frequency of genotypes) What Darwin didn’t know - The molecular structure of the units of hereditary The study of inheritance in the 19 th century - Pedigrees - Breeding o 1.hybridizers(scientists) o 2.Practical breeders - Darwin: Gemmules are the units of inheritance o Each individual has many small particles, located in the germ cells o These are invisible o They multiply by division o They are transmitted to daughter cells from mother cells o Know nothing of Mendel’s work - Mendel’s work is buried “in the archives” for forty years…
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2-6-09 - 1990 frequency of carbonaria only 30 The Clean Air...

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