HIST10014 Lecture Notes - Lecture 21: Theodosius Dobzhansky, Keystone Species, Genetic Diversity
6 Aug 2018
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Antimicrobial resistance: ability to survive antibiotics, like penicillin. Diversity within species phenotypic variation genotypic variation di erent kinds of species variation in a particular trait across species. All diversity is the product of evolutionary processes. Nothing in biology makes sense, except in the light of evolution - theodosius dobzhansky. The origin of life on earth dates back an incredible 3. 5 4 billion year. Others have disappeared through competition climatic changes natural catastrophes as the earth itself has evolved. Species going extinct at a rate 1000-10000x faster than before human intervention. Each species represents a big amount of genetic information, from 1000 to 400 000 genes. Each species represented by many individuals (less than a few thousand to many millions) When a species goes extinct it can never reappear. We do not know what will be the ecological impact of a continuing loss of species. Some, are keystone species upon which whole communities depend.
