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courses.lumenlearning.com/boundless-ap/chapter/sources-of-genetic-variation

Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the 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 ...

www.khanacademy.org/.../hs-phylogeny/v/genetic-variation-gene-flow-and-new-species

How genetic variation is the raw material of evolution, and how restricted gene flow can lead to the formation of new species. Video by California Academy of Sciences.

science.education.nih.gov/.../webversions/Genetic/guide/genetic_variation1.html

But our interest in human genetics does not stop at the boundaries of the species, for what we learn about human genetic variation and its sources and transmission inevitably contributes to our understanding of genetics in general, just as the study of variation in other species informs our understanding of our own.

www.answers.com/Q/How_does_genetic_variation_lead_to_evolution

Mutations, gene flow and sex are the primary sources of genetic variation which may lead to evolution. Without genetic variation, evolutionary change cannot operate.

courses.lumenlearning.com/boundless-biology/chapter/population-genetics

Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the 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 ...

www.learnreligions.com/how-genetic-mutations-drive-evolution-249890

All evolution is based on genetic change. Scientists still have a lot to learn about the workings of the genetic code, but science has built up a large volume of knowledge about how the genetic material of living organisms works. We have a pretty good understanding of what DNA does in general and, equally important to evolution, how DNA changes.

www.genetics.org/content/193/1/95

Expression quantitative trait loci (eQTL) studies have established convincing relationships between genetic variants and gene expression. Most of these studies focused on the mean of gene expression level, but not the variance of gene expression level ( i.e. , gene expression variability). In the present study, we systematically explore genome-wide association between genetic variants and gene ...

www.dummies.com/.../science/biology/sexual-reproduction-creates-genetic-variation

Sexual reproduction increases genetic variation in offspring, which in turn increases the genetic variability in species. You can see the effects of this genetic variability if you look at the children in a large family and note how each person is unique. Imagine this kind of variability expanded to include all the families you know […]

anthropology.msu.edu/anp202-us14/2014/07/06/mitosis-meiosis-and-spotting-genetic-variation

Genetic Variation is all around us every single day. A big example is in my own family. My parents had four children. Two of us have blue eyes, and the other two have brown eyes. Without the explanation of genetic variation, we would have some bigger questions of how my parents could have four children each with different physical characteristics.

www.livescience.com/1796-forces-evolution.html

Genetic drift is a random process in which chance plays a role in deciding which gene variants (alleles) survive. Gene flow occurs when genes are carried from one population to another.