Chance events can also cause allele frequencies to fluctuate unpredictably from one generation to the next especiallyin small populations .
What is genetic drift ?
100
Allele frequencies change due to the transfer of alleles into or out of a population due to the movement of fertile individuals or their gametes.
What is gene flow?
100
"Struggle for existence" and "survival of the fittest"
What is natural selection ?
100
A group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring
What is a species?
200
The principle that frequencies of alleles and genotyes in a population remain constant from generation to generation, provided that only Mendelian segregation and recombination of alleles are at work.
What is Hardy Weinberg principle ?
200
Darwin's concept of _______ is based on differential success in survival and reproduction...
What is natural selection ?
200
The alleles that are exchanged between populations; gene flow reduces this between the populations.
What is genetic differences?
200
The contribution an individual makes to the gene pool of the next generation relative to the contributions of other individuals.
What is relative fitness ?
200
Blocks fertilization from occurring .
What is prezygotic barriers?
300
The evolution that results in a better match between organisms and their environment.
What is adaptive evolution?
300
Gene flow transfers alleles that are intended to improve the ability of conditions.
What is adapting to local conditions?
300
common when a populations environment or when members of a population migrate to a new habitat.
What is directional selection ?
300
The biological species concept doesn't apply to organisms that reproduce asexually all or most of the time.
What is prokaryotes?
400
This is used as an initial test of whether evolution is occurring in a population.
What is hardy Weinberg equation?
400
A sudden change in the environment, such as a fire and or flood, may drastically reduce the size of a population.
What is bottle neck effect ?
400
Gene flow is an increasingly important agent that changes in human populations.
What is evolutionary changes?
400
If individuals who are heterozygous at a particular locus have greater fitness than do both kinds of homozygotes.
What is heterozygous advantage ?
400
Characterizes a species by body shape and other structural features.
What is morphological species concept?
500
The mutation rate for the ________ is low, inbreeding is not common in the U.S .
What is PKU gene ?
500
1. Genetic drift is significant in small populations.
2. Genetic drift can cause allele frequencies to change at random.
3. Genetic drift can lead to a loss of genetic variation within populations.
4. Genetic drift can cause harmful alleles to become fixed.
What is the effects of genetics drift?
500
This has become more common between members of a population that previously had very little contact leading to an exchange of alleles and fewer genetic differences between those populations
What is mating?
500
The fitness of a phenotype depends on how common it is in the population.