What are 3 ways natural selection can change a distribution of traits?
Natural selection on single-gene traits can lead to changes in allele frequencies and, thus, to changes in phenotype frequencies. Natural selection on polygenic traits can affect the distributions of phenotypes in three ways: directional selection, stabilizing selection, or disruptive selection.
What is the result of a change in the allele frequency of a gene pool?
The bottleneck effect results in a drastic change of allele frequencies of a gene pool causing genetic drift. This dramatic change in allele’s occurs as a result of natural disasters such as earthquakes or floods.
What is genetic drift give example?
Eg., two birds of the same species reach an island. Their alleles will be responsible for the diversity on that island. These alleles will dominate and mutations in the population will lead to the formation of new species. The new population will diverge to such an extent that they will no longer interbreed.
What is genetic drift and examples?
Genetic Drift Examples In the population, the different alleles that create coat color are equally distributed. A disease comes into the rabbit population and kills 98 of the rabbits. The only rabbits that are left are red and grey rabbits, simply by chance. The genes have thus “drifted” from 6 alleles to only 2.
How do you explain gene flow?
Gene flow is also called gene migration. Gene flow is the transfer of genetic material from one population to another. Gene flow can take place between two populations of the same species through migration, and is mediated by reproduction and vertical gene transfer from parent to offspring.
What is the process of gene flow?
Gene flow is the process by which certain alleles (genes) move from one population to another geographically separated population. High gene flow in a pathogen increases the size of the population and of the geographical area in which its genetic material occurs.
What is the difference between migration and gene flow?
Migration occurs whenever an organism physically moves into a new area or joins a new population. However, gene flow only occurs when the populations interbreed. Even then, it is only considered gene flow if the populations are exchanging alleles and changing the allele frequency of one or both populations.
How does natural selection relate to gene flow?
Natural selection is like genetic drift but with one major difference—it’s not random. One major way gene flow is different from natural selection is that gene flow helps keep alleles in a population homogenized while natural selection increases genetic variation and always moves toward creating new species.