theory on evolution Flashcards
this theory states that the Earth has been shaped by sudden, often unpredicted, events that are short-lived but impactful. It proposes the idea that catastrophes are responsible for mass extinctions and other processes
Catastrophism by Georges Cuvier
organisms alter their behavior in response to environmental change. Their changed behavior, in turn, modified their organs, and their offspring inherited those “improved” structures
Inheritance of Acquired Trait by Jean-Baptiste Lamarck
descent with modification,” the idea that species change over time, give rise to new species, and share a common ancestor
evolution as define by Charles Robert Darwin
causes populations to become adapted, or increasingly well-suited, to their environments over time. Natural selection depends on the environment and requires existing heritable variation in a group
Theory of Evolution as means of Natural Selection by Charles Darwin
Father of Evolution
Charles Robert Darwin
Darwin boarded this ship to spend his 5 year voyage in his scientific study to explain evolution
H.M.S Beagle (1831-1836)
Four Basic Principles of Natural Selection
- Variation
- Heritability
- Overpopulation/Overproduction
- Reproductive Advantage
refers to the degree of adaptation of an individual to its environment which is passed onto future generations
fitness
Mechanisms of Evolution
- Natural Selection
- Genetic Drift
- Artificial Selection
- Mutation
- Migration
- Recombination
Random change in the frequency of gene. In each generation, some individuals may, just by chance, leave behind a few more descendants than other individuals
genetic drift
this mechanism usually predominates in large populations that results in evolution when individuals with higher survival and reproductive rates pass on these traits to their offspring
Natural Selection
is a technique in which the intervention of humans allows only for selected organisms to breed and produce offspring
Artificial Selection
A change in the DNA of an organism, a random event and it may be beneficial or harmful
mutation
is the movement of populations, groups or individual species
migration
the movement of genetic characteristics from one population to another
gene flow