EBIO 1220 Lecture Notes - Lecture 2: Theodosius Dobzhansky, Wide Open Space, Darwin Awards
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20 Jan 2017
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Learning goal: describe how natural selection and genetic drift lead to evolutionary change: the darwinian revolution, descent with modification. Mechanisms of evolution: natural selection, genetic drift. Nothing in biology makes sense except in the light of evolution - theodosius. Evolution: change in the genetic composition of a species over time, such that species alive today are the descendants of ancestral species. The earth is young (1000"s of years old) The environment is unchanging (canyons, mountains, continents, etc. ) Species do not change; all species have remained the same since creation (aristotle) There is no such thing as a new species. Closely related to each other and to mainland species. All of these birds were related and probably traced back to a common ancestor, but as time went on birds adapted to the local conditions of the island they live and and eventually turned into different species. Their beaks were suited to the availability of particular foods.
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Related Questions
Question 1
Evolutionary algorithms are used:
In engineering, to arrive at solutions by going through many permutations of possible solutions and allowing them to evolve. |
A genetic feature of complex organisms. |
A process undergone by the human brain, which is similar to evolution by natural selection. |
Another term used for a computer algorithm in general. |
Question 2
Human literature and languages can be studied using methods similar to those used for constructing phylogenies because:
There is no other way of studying these things. |
Languages evolve roughly along the lines of species, with mutations (changes in words and pronunciation), descent with modification (languages becoming more different along the way), and branching of languages (languages giving rise to other languages that are similar to them). |
Because literature and languages are constructed by organisms (human beings), so what applies to one must apply to the other. |
Languages undergo a process of word swapping, which is analogous to horizontal gene transfer. |
Question 3
The degree to which horizontal gene transfer occurs in eukaryotes is:
Something upon which the entire validity of evolutionary biology hinges. |
A mystery that may or may not disprove evolution, but we simply don't know enough about it at this point. |
Something that would overthrow the notion that this phenomenon is important in bacteria. |
An interesting and potentially important aspect of biology with relevance for how evolution occurs, but not something that would call it into question one way or the other. |
Question 4
Learning about the history of scientific theories and the reasons for why they are initially accepted or rejected is important mostly because:
It makes for exciting story telling, and this is very much needed to get people interested in science. |
It teaches us about the process of science as it actually occurs, which is somewhat different to the idealized notion of a purely objective undertaking. |
It tells us which theories are definitely true or false. |
It tells us that science is actually a totally subjective process that tries to present itself as objective. In reality, personal subjective factors are the only relevant factors that really matter in science. |