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Chapter 16 genes and variations

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by

Luca Villeneuve

on 28 June 2016

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Transcript of Chapter 16 genes and variations

Variations and Genes
-importance of Mendel's work on inheritance in peas was not recognized during Darwin's lifetime
-During 1930's Darwin and Mendel's work=connected
-changes in genes produce heritable variation on which natural selection can operate
-Genes were very important for new hypothesis and understand evolution
-Watson & Cricks study on DNA helped demonstrate molecular nature of genetic variation and mutation
-Genes have at least two forms or alleles
-All organisms have additional genetic variation (invisible)
-Involve small differences in biochemical process
-insect heterozygous for 15% of genes
-fish heterozygous 4-8% of genes
-2 main sources of genetic variation= mutations and gene shuffling that results from sexual reproduction
-consists of all genes and the different alleles
-important to evolutionary theory because evolution involves changes in population over time
- relative frequency : amount of times the allele occurs in gene pool, compared with the number of times other alleles occur
Chapter 16 genes and variations
By: Luca Villeneuve, Tea Romano, & Jason hahn

Gene pools
Variations
Full transcript