Whats a founder effect?
The founder effect is the reduction in genetic variation that results when a small subset of a large population is used to establish a new colony. The new population may be very different from the original population, both in terms of its genotypes and phenotypes.
What is an example of the founder effect quizlet?
The founder effect is when only a few males within a population are selected by females to reproduce, generating an allele frequency which is different from the original population. An example of the founder effect is the reproductive pattern of mountain gorillas.
What Does Stabilizing selection mean in biology?
stabilizing selection: a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value.
How does the curve change in stabilizing selection?
Stabilizing selection: Intermediate phenotypes have the highest fitness, and the bell curve tends to narrow. Directional selection: One of the extreme phenotypes has the highest fitness. The bell curve shifts towards the more fit phenotype.
What are 3 ways natural selection can change a distribution of traits?
Natural selection on polygenic traits can affect the distributions of phenotypes in three ways: directional selection, stabilizing selection, or disruptive selection.
Is the evolution of the human brain is an example of stabilizing selection?
Stabilizing selection in evolution is a type of natural selection that favors the average individuals in a population. Classic examples of traits that resulted from stabilizing selection include human birth weight, number of offspring, camouflage coat color, and cactus spine density.
What are 3 types of evolution by natural selection?
The 3 Types of Natural Selection
- Stabilizing Selection.
- Directional Selection.
- Disruptive Selection.
What are the four kinds of evidence that evolution has occurred?
Evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation.
What theories of evolution are there?
- Vitalism.
- Theistic evolution.
- Orthogenesis.
- Lamarckism.
- Catastrophism.
- Structuralism.
- Saltationism, mutationism.
- Genetic drift.
Who was the first person to come up with evolution?
The founder of the modern theory of evolution was Charles Darwin. The son and grandson of physicians, he enrolled as a medical student at the University of Edinburgh. After two years, however, he left to study at the University of Cambridge and prepare to become a clergyman.