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BIOC51H3 Lecture Notes - Theodosius Dobzhansky, Special Creation, New Idea

Biological Sciences
Course Code
Maydianne Andrade

of 2
Evolutionary Biology BIOB51Lecture 1
-incorporated Darwin’s theory in genetic
Slide 30
-tentacles around the nose detect the food
-send information to the brain and make a decision whether to eat or leave the food within 25
-fastest nervous transmission
-flat fish and cattle fish camouflage by imitating the surrounding environment
-change its epidermis to match the colour, shape, and texture
Big questions in biology
Special Creation
-species are created independently
-do not change and remain the same over time
-species were created recently and at the same time
-supernatural force
Before Darwin, observations suggested
1. Species change
-fossil record suggests changes in form and shape
2. Extinction
-some species are lost, not the same in the past
3. Time-series of species appearance
-species are not formed at the same time
-some arise from previous species
4. Environments had changed over time
-change radically, such as earthquake, land sliding
-if environment changes and species do not change, then they will not be well suited and adapted
to the new environment
-species must change to adapt change in environment
5. Relatedness of species
-some species are similar to each other, but possess characteristics that distinguish them from
other species
-similarity clusters within family
-animal kingdom proposes similarities within diversity
-recognition of pattern in natural world that is independent of Darwin
New Idea
-earth was ancient, supported by fossil record
-common family line, inherited characteristics from ancestors
-these only suggest evolution, but not adaptation
-did not propose theory of evolution
-develop natural selection, the mechanism in which evolution occurs that lead to adaptation
-descendent with modification
4 Postulates
1. Variation in species
-individuals in the population have different physical characteristics
2. Variations are heritable
-characteristics change over time to form new characteristics
-small changes from one to next generation accumulate to form new species
3. More individuals are produced than those who survive and reproduce
-high reproductive potential do not mean all individuals have ability to survive to reproduce