Which of the following increases genetic variation when individuals move from one population to another population?

The flow of individuals in and out of a population introduces new alleles and increases genetic variation within that population. Mutations are changes to an organism’s DNA that create diversity within a population by introducing new alleles.

Which type of selection is shown in the graph disruptive selection?

Graph 2 depicts stabilizing selection, where the intermediate phenotype is favored over the extreme traits. Graph 3 shows disruptive selection, in which the extreme phenotypes are favored over the intermediate.

What determines which genes or traits will persist in a population?

Genetic variation in a population is derived from a wide assortment of genes and alleles. The persistence of populations over time through changing environments depends on their capacity to adapt to shifting external conditions.

What effect does natural selection have on population variation?

Natural selection can decrease the genetic variation in populations of organisms by selecting for or against a specific gene or gene combination (leading to directional selection).

How do environmental factors affect genetic variation?

These results suggest that ecological factors can have strong impacts on both population size per se and intrapopulation genetic variation even at a small scale. On a more general level, our data indicate that a patchy environment and low dispersal rate can result in fine-scale patterns of genetic diversity.

Does gene flow increase or decrease genetic variation?

Gene flow within a population can increase the genetic variation of the population, whereas gene flow between genetically distant populations can reduce the genetic difference between the populations.

How does disruptive selection increase genetic variation?

Under disruptive selection, individuals with extreme values for a trait have greater reproductive success than individuals with intermediate values. Because the values for the trait in the resulting population are further from the population mean, the variation of the trait is increased.

What causes disruptive selection?

Disruptive selection occurs when individuals of intermediate phenotype are less fit than those of both higher and lower phenotype, such that extremes are favored. This may occur if there are two diverse food sources or predators with diverse preferences for, say, size of prey.

What causes genetic variation in a population?

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

How is genetic variation maintained in most populations?

What are three ways that genetic variation is maintained in our world? Overall, the main sources of genetic variation are the formation of new alleles, the altering of gene number or position, rapid reproduction, and sexual reproduction.

Does natural selection cause genetic variation?

Natural selection can produce genetic variation among demes within a metapopulation if different selective pressures prevail in different demes.

Why do smaller populations have more genetic variation?

This is because some versions of a gene can be lost due to random chance, and this is more likely to occur when populations are small. Additionally, smaller population size means that individuals are more likely to breed with close relatives.

Why are small populations more susceptible to genetic drift?

Small populations tend to lose genetic diversity more quickly than large populations due to stochastic sampling error (i.e., genetic drift). This is because some versions of a gene can be lost due to random chance, and this is more likely to occur when populations are small.

What are the effects of a small population size?

Effect of small population size. Small populations tend to lose genetic diversity more quickly than large populations due to stochastic sampling error (i.e., genetic drift). This is because some versions of a gene can be lost due to random chance, and this is more likely to occur when populations are small.

What do you mean by genetic variation?

Genetic variation refers to the fact that different individuals of a population have different alleles of genes. Nice work! You just studied 68 terms! Now up your study game with Learn mode.