Task 4 - God, Nature, Time Flashcards
Before Darwin
Before Darwin, Lamarck developed a comprehensive theory of evolution, which stated that new varieties come into existence because organisms are actively and purposefully striving to better themselves.
Principle of use and disuse
If you do not use it, you lose it.
Principle of inheritance of acquired characteristics
During life acquired characteristics are passed on to offspring.
Charles Darwin
1809-1882
Owned several greenhouses in England, in which exotic and continuously evolving plants were cultivated.
His first observation was that plants that were capable of self-fertilization avoided it. Furthermore, if it happened, the offspring were on average less healthy.
• Cross-fertilization produced variation in the offspring that was more vital and sometimes led to the creation of a new type of flower. Later he realized that the process of natural selection is responsible for the fact that some variants have an advantage over others and outgrew them.
Natural selection
A process in Darwin’s evolutionary theory by which the environment causes the continuation & replication of organisms with certain genetic features (favorable features) and hinders the reproduction of organisms with other genetic features (unfavorable features).
Survival of the fittest
The outcome of natural selection.
Only organisms that fit within the environment and can produce viable offspring survive.
(Darwin)
The origin of species
The book containing Darwin’s theory, published in 1859.
Darwins theory is based on 3 fundamental ideas:
INHERITANCE: when individuals in a population reproduce, the new generation resemble their parents.
VARIATION: the similarities between generations is close, but not perfect, so that each generation includes new variations in traits. SELECTION: there is a link between the new variations and the chances that an individual will be better able to survive & reproduce.
Dilution problem
It was initially thought that in the process of mating characteristics get averaged (e.g. a tall person will have an average-height child with a short person), which would eventually lead to all people becoming clones of each other.
This problem was resolved when it became known that inheritance includes copying genes, which can produce random changes in the DNA information (mutations) and eventually lead to variation in the population.
Neo-Darwinism
The addition of genetics to Darwinism.
Intelligent Design
Intelligent design (ID) is a view that originated in the late 1700s, conceived by William Paley, who stated that the complex adaptations & functions of organisms imply a divine Creator.
Even though this is not a philosophically robust argument, it was influential in its day.
Irreducible complexity
A view of the ID framework, which states that removing one part of a complex structure that leads to malfunction in the structure is proof that the structure and its function could not have evolved by natural means.
There is counterevidence in evolution as well in fossil records against this view.
Specified complexity
an attempt to quantify the unlikelihood of irreducible complexity. Uses probability theory to rule out the possibility that a structure evolved either by natural processes or chance.
The attempt is mathematically flawed.
Micro evolution
Change within populations.
Macroevolution
The origin of major groups and new adaptations.