Genetic variation is the result of mutation, gene flow between populations and sexual reproduction. In asexually reproducing organisms, some genetic variation may still result from random mutation.
Genetic variation generally refers to the differences in genes between individual members of a population, or the frequency in which the various gene types are expressed. Genetic variation is incredibly important for the survival and adaptation of a species, as it helps in terms of natural selection
Genetic variation is important because a population has a better chance of surviving and flourishing than a population with limited genetic variation. Genetic diversity also decreases the occurrence of unfavorable inherited traits.
Crossing over creates genetic variation by exchanging DNA between two nonsister chromatids to produce genetically unique chromosomes. The process of crossing over occurs during meiosis.
The two main sources of genetic variation are mutations and recombinations of genes as a result of sexual reproduction. A mutation is a permanent change in the DNA within a gene.
Genetic variation is important to evolution because it helps to maintain the health of a population by constituting alleles that may be useful in overcoming stresses such as diseases and pests. Without genetic variation, some of the fundamental mechanisms of evolutionary changes would not operate.
Human genetic diseases attributable to changes in a single gene include sickle cell anemia, cystic fibrosis, Huntington's disease and fragile X syndrome, explains the World Health Organization. Examples of diseases that are not purely genetic but have a genetic component include cancer, diabetes, as
Disruptive selection tends to increase genetic variation in populations, according to About.com. It is the opposite of stabilizing selection, which tends to drive a population toward a mean genotype and eliminate outliers on either end of the population average.
Specific human genetic disorders include cystic fibrosis, Down syndrome, hemophilia, autism and some types of cancer, according to the National Human Genome Research Institute. Additional human genetic disorders include Crohn's disease, thalassemia, sickle cell disease, Parkinson's disease and Marfa
Meiosis contributes to genetic variation by creating new groups of genes, according to the University of Miami Miller School of Medicine. The new groups are created when chromosomes passed down from a mother and father share instructions encoded into genes. The process of mixing genes leads to offsp