Quick Answer: Which Situation Is Most Likely To Decrease Genetic Variation?

How does random mating contribute to genetic variation?

Mendelian segregation has the property that random mating results in an equilibrium distribution of genotypes after only one generation, so genetic variation is maintained.

The equilibrium is the direct consequence of the segregation of alleles at meiosis in heterozygotes..

How do you maintain genetic variation?

Finally, changing patterns of selection over time or space can help to maintain genetic variation in a population. If selection patterns fluctuate over time, different alleles or genotypes may enjoy greater fitness at different times. The overall effect may be that both alleles persist in a population.

How do you identify genetic variation?

Genetic variation can also be identified by examining variation at the level of enzymes using the process of protein electrophoresis. Polymorphic genes have more than one allele at each locus.

What adds genetic variation is essential for evolution?

Genetic variation will increase because of a new habitat and food source. What will most likely happen to the population of moths in this habitat? The moths will evolve due to a selective pressure. What does the theory of evolution contribute to conservation biology?

Does natural selection increase or decrease variation within a population?

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). … Selection can also prevent speciation by homogenizing the population genetic structure across all locations.

Is most likely to decrease genetic variation?

Small populations In small population sizes, inbreeding, or mating between individuals with similar genetic makeup, is more likely to occur, thus perpetuating more common alleles to the point of fixation, thus decreasing genetic diversity.

Which of the following ways is most likely to decrease the genetic diversity in a population?

So, the correct answer is ‘Stabilising natural selection’.

What are the 3 types of genetic variation?

For a given population, there are three sources of variation: mutation, recombination, and immigration of genes.

How do environmental factors affect genetic variation?

Genetic diversity can also have important ecological consequences within populations, and in turn, ecological factors may drive patterns of genetic diversity. … 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.

What is genetic variation in a population?

​Genetic Variation Genetic variation refers to diversity in gene frequencies. Genetic variation can refer to differences between individuals or to differences between populations. Mutation is the ultimate source of genetic variation, but mechanisms such as sexual reproduction and genetic drift contribute to it as well.

What decreases genetic variation?

Sources of Decreased Variation Mutation, recombination, and gene flow all act to increase the amount of variation in the genotypes of a given population. There are also forces at work that act to decrease this variability.

What influences genetic variation the most?

However, existing genes can be arranged in new ways from chromosomal crossing over and recombination in sexual reproduction. 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.

What is an example of genetic variation?

Genetic variation refers to differences in the genetic makeup of individuals in a population. Genetic variation is necessary in natural selection. … Examples of genetic variation include eye color, blood type, camouflage in animals, and leaf modification in plants.

What increases genetic variation in meiosis?

Genetic variation is increased by meiosis Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I.

What are the causes of variation in clones?

Genetic variation can be caused by a mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).