Which of the following is a true statement concerning genetic variation?

a. It must be present in a population before natural selection can act upon the population.

b. It tends to be reduced by the processes involved when diploid organisms produce gametes.

c. It is created by the direct action of natural selection.

d. A population that has a higher average heterozygosity has less genetic variation than one with a lower average heterozygosity.

e. It arises in response to changes in the environment.

Genetic variation is the difference in the DNA sequences in individuals, which makes a member of a species different from another member of the same species. It can also be said to be the differences in the genetic make up of individuals of a species population.

Genetic variation must be present in a species population before evolutionary mechanisms, such as evolution, can occur. Genetic variation must be present in a population of a species before natural selection can act upon the population, as natural selection can only increase or reduce the frequency of alleles present in the species population already.

Genetic variation in a population of species is important for natural selection to occur.

blessinglovely41 blessinglovely41 · Answer 2 · 2020-04-12T07:56:42+02:00

Answer: The correct answer to the question is option A

IT MUST BE PRESENT IN A POPULATION BEFORE NATURAL SELECTION CAN ACT UPON THE POPULATION.

Explanation: Genetic variation is a term used to describe the variation in the DNA sequence in each of our genomes.Individuals of a species have similar characteristics but they are rarely identical, the difference between this individuals is what we call variation. It is the difference in DNA among individuals.

In natural selection organisms with favorable traits are more likely to reproduce. In doing so, they pass on these traits to the next generation. Over time this process allows organisms to adapt to their environment.

For organisms to better adapt to their environment tending to survive and produce more offspring(natural selection),there must be a difference in DNA among the organisms.

Some of the causes of genetic variation are gene flow, and sexual reproduction. DNA mutation causes genetic variation by altering the genes of individuals in a population. Examples of genetic variation include eye color, blood type, camouflage in animals, and leaf modification in plants, genetic variation are sourced from mutation,random mating between organisms,random fertilization and crossing over (or recombination) between chromatids of homologous chromosomes during meiosis.