Which event is most likely to increase the genetic variation in a population of organisms?
It should be noted that mutation is the ultimate source of genetic variation in all populations—new alleles, and, therefore, new genetic variations arise through mutation.
What are 5 causes of genetic variation in a population?
Genetic variation can be caused by 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).
What is most likely to happen to the population of mice that becomes isolated on an island?
What is most likely to happen to a population of mice that becomes isolated on an island? Many different species will form as they evolve to fill different niches on the island.
What are 3 causes of genetic diversity?
The genetic diversity has three different sources: mutation, recombination and immigration of genes. Mutation is the driving force of genetic variation and evolution.
Which type of selection increases genetic variation?
disruptive selection Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.
What causes 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 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.
What is genetic variation in population?
Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing environmental circumstances.
What is most likely to happen to a population of mice that become isolated on an island Brainly?
What is most likely to happen to a population of mice that becomes isolated on an island? Many different species will form as they evolve and fill different niches on the island.
Which situation is most likely to decrease genetic variation?
Inbreeding, genetic drift, restricted gene flow, and small population size all contribute to a reduction in genetic diversity. Fragmented and threatened populations are typically exposed to these conditions, which is likely to increase their risk of extinction (Saccheri et al.
How does genetic variation occur?
Genetic variation occurs as alleles in gametes are separated and randomly united upon fertilization. The genetic recombination of genes also occurs during crossing over or the swapping of gene segments in homologous chromosomes during meiosis.
What are two main sources of genetic variation?
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 does selection affect genetic variation?
The consequence of natural selection on the genetic structure and evolution of organisms is complicated. 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 does genetic variation happen?
Genetic variation occurs as alleles in gametes are separated and randomly united upon fertilization. The genetic recombination of genes also occurs during crossing over or the swapping of gene segments in homologous chromosomes during meiosis.
What is genetic variation quizlet?
Genetic variation is the diversity present in the DNA of a population. Increased variation provides phenotypic changes that can be selected for or against by natural selection. Increased genetic variation also provides an advantage in adapting to changing environments.
Which population would be more likely to be affected by 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.
In which population would the rate of genetic drift be the greatest?
In which population would the rate of genetic drift be the greatest? A small population that is geographically isolated from its parent population.
Which of the following will most likely decrease genetic diversity?
So, the correct answer is 'Stabilising natural selection'.
Which of the evolutionary forces is most likely to decrease genetic variation between populations?
Which of the evolutionary forces is most likely to decrease variation between two populations? Genetic drift is the force of evolution that is most powerful when acting on very large populations.
What is genetic variation examples?
Genetic variation results in different forms, or alleles?, of genes. For example, if we look at eye colour, people with blue eyes have one allele of the gene for eye colour, whereas people with brown eyes will have a different allele of the gene.
Which increases genetic variation?
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 is genetic variation in a population?
Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing environmental circumstances.
What process increases genetic variation?
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.
Does genetic drift increase or decrease genetic variation?
Genetic drift involves the loss of alleles from a population by chance. Random fluctuations in allele frequencies in small populations reduce genetic variation, leading to increased homozygosity and loss of evolutionary adaptability to change.
How does genetic drift affect populations?
Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool. Genetic drift can also cause a new population to be genetically distinct from its original population, which has led to the hypothesis that genetic drift plays a role in the evolution of new species.
How does genetic drift affect a population?
Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool. Genetic drift can also cause a new population to be genetically distinct from its original population, which has led to the hypothesis that genetic drift plays a role in the evolution of new species.
Does genetic drift increase genetic variation?
Explanation: Genetic drift decreases genetic diversity within a population. It is a change in allele frequencies due entirely to random chance and is more likely to affect smaller populations than large ones. Population bottlenecks can lead to genetic drift.
Which of the following is likely to result in decreased genetic variation in a population?
So, the correct answer is 'Stabilising natural selection'.
Which event normally contributes to genetic variation?
Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination.
Which process creates genetic diversity in a population?
Recombination is a process by which pieces of DNA are broken and recombined to produce new combinations of alleles. This recombination process creates genetic diversity at the level of genes that reflects differences in the DNA sequences of different organisms.