Natural Selection/Genetic Drift
1. Genetic Drift: This represents random changes in small gene pools due to sampling errors in propagation of alleles. The bottleneck effect and founder effect are prime examples of genetic drift. In either case the number of individuals in a population is drastically reduced distorting the original allelic frequencies.
2. Gene Flow: The movement of alleles into and out of a gene pool. Migration of an organism into different areas can cause the allelic frequencies of that population to increase. Most populations are not isolated, which is contrary to the Hardy-Weinberg Theorem.
3. Mutations: These changes in the genome of an organism are an important source of natural selection.
4. Nonrandom mating: Inbreeding is a popular form of nonrandom mating. Individuals will mate more frequently with close individuals than more distant ones. Assortive mating, is another form of nonrandom mating. Here the individuals will mate with partners that closely resemble themselves in certain characteristics.
5. Natural Selection: Populations vary in the types of individuals and their reproductive success. Those individuals who leave more offspring behind than others, pass on more of their alleles and have a better success rate in dominating the population.
A gene pool must have lots of variation in the genotypes and phenotypes before the formation of species.
all alleles for all genes in a population.
Mutations can occur in gene processing errors.
Directional selection.
a gene pool is the mixture of a group of a species' genes. like, if you took all of the DNA of a group of people, and mixed it all together, that would be a gene poolThe total of all alleles present in a population.All of the alleles in one population
The population needs to be small is the necessary condition for genetic drift to have a significant effect on populations.
A genetic mutation within the population.
natural selection or genetic drift
Mutation can create new alleles, therfore can change allele frequencies in a population.
Change in the allele frequency within the gene pool. ?
evolution within a species. the allele frequencies in a gene pool of a population
fungi is yellow
An individual organism moves into a new population
Gene flow within a population distributes mutations among the individuals. Immigration and emigration transport alleles into and out of a population's gene pool, thus affecting the result of natural selection.
Artificial selection
genetic drift
An individual organism moves into a new population
Answer: Reproductive Isolation