G theodosius dobzhanksy catastrophic crop failures

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Unformatted text preview: erm repercussions: – Generations of lost Russian genetics and evolutionary biology – Prominent evolutionists refused to return to USSR • e.g. Theodosius Dobzhanksy – Catastrophic crop failures and famines due to agricultural rejection of Mendel & Darwin 9 10 -Large scale implication of failed science casued people to die of s tarvation -Scientists that supported evolution and Mendellian genetics were killed or sent to labour camps Why am I mentioning this ? Back to crop diversity • From the Bio 220 course description: • What happens during domestication of crops? – “Evolutionary genetic and ecological perspectives on wide ranging topics including disease, aging, sexual conflict, genetics of human differences, conservation, and global climate change. …Responsibilities of human societies in a changing world.” – Severe bottleneck: only a tiny subset of individuals of the wild population are chosen to be cultivated • Repressing or ignoring inconvenient data, or pretending that it does not exist can have real world consequences for human societies – Strong artificial selection: humans breed and retain the best performing crop plants • As science students, part of your training will be to follow the data. This applies to evolution, global climate change, endangered species, medicine, etc. • What are the consequences of bottlenecks and artificial selection? -Clearly this anecdote about Lysenko explains the risks of f ollowing ideology, rather than the data • Selection on germination timing, seed size, nutrition 11 12 -Humans ser ve to be some of the strongest, most efficient s elective forces 2 04/03/2013 Consequences of Domestication Why do we care about genetic variation in crops? • Reduced genetic variation 1. Clues to past artificial selection – On what traits did our ancestors select? • Ways to measure H: Average frequency of heterozygous individuals per gene locus P: Proportion of gene loci that are polymorphic : Average number of nucleotide differences per site, fo...
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