Lecture 14 - BIO220

G theodosius dobzhanksy catastrophic crop failures

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online