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Natural Selection
Natural Selection
100
Selection that favors BOTH of the extremes (or both homozygotes). A population of black, white and gray rabbits in an environment with black and white rocks could serve as an example of this. Black rabbits could hide in black rocks and white rabbits could hide in white rocks. The gray rabbits would have a hard time hiding anywhere.
What is disruptive selection?
100
Selection in which humans choose desirable traits and breed organisms accordingly.
What is artificial selection?
200
The disproportionate representation of a certain allele due to a population at one point being reduced to a select few individuals that had a high representation of this allele. The Askenazi Jews are an example of this. During WWII, their populations decreased significantly. By chance the remaining population had a high number of the allele that codes for the deadly disease, Tay-Sachs.
What is bottleneck effect?
200
A trait or behavior that helps one survive and reproduce in its environment.
What is an adaptation?
300
Selection that causes an increase in allele frequency of a specific allele, or one or the other of the homozygous genotypes. The increase of beak size in finches due to a high proportion of large seeds in an ecosystem could be considered an example of this.
What is directional selection?
300
The definition of evolutionary fitness.
What is the ability to survive and reproduce?
400
Selection that leads to a high proportion of heterozygotes due to the heterozygote advantage. Sickle cell is an example of this.
What is stabilizing selection?
400
The idea that parents can pass on traits acquired within their lifetime to their offspring was credited to Lamark and long thought to be entirely incorrect. The emerging field of epigenetics is started to prove this concept may be somewhat true.
What is the inheritance of acquired characteristics?
500
The new study of genetics that may be adding legitimacy to Lamark's theory.
What is epigenetics?
500
The fundamental difference between Darwin and Lamark's theory of evolution.
What is the mechanism causing evolution--Lamark: use and disuse, Darwin:natural selection?