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bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book:_General...

Sources of Genetic Variation. Gene duplication, mutation, or other processes can produce new genes and alleles and increase genetic variation. New genetic variation can be created within generations in a population, so a population with rapid reproduction rates will probably have high genetic variation.

wwnorton.com/college/biology/evolution/ch/06/outline.aspx

Genetic variation enters a population from one of four sources: recombination, mutation, migration, or lateral gene transfer. Mutation rates can be measured in many ways and differ across species and even across different tissue types in the same species.

en.wikipedia.org/wiki/Human_genetic_variation

Human genetic variation is the genetic differences in and among populations.There may be multiple variants of any given gene in the human population (), a situation called polymorphism.No two humans are genetically identical. Even monozygotic twins (who develop from one zygote) have infrequent genetic differences due to mutations occurring during development and gene copy-number variation.

www.numerade.com/questions/there-are-three-sources-of-genetic-variation-in...

There are three sources of genetic variation in sexual reproduction. Which is not considered random? a. All are random. b. Crossing over c. Egg and sperm fertilization d. Tetrad alignment on the meiotic spindle.

www.answers.com/Q/What_are_the_three_sources_of_genetic_variation_in...

The three sources of genetic variations are mutation, recombination, and immigration of genes. Mutations are changes in DNA. Genetic recombination is when two DNA molecules exchange genetic ...

en.wikipedia.org/wiki/Race_and_genetics

Genetic variation arises from mutations, from natural selection, migration between populations and from the reshuffling of genes through sexual reproduction. Mutations lead to a change in the DNA structure, as the order of the bases are rearranged. Resultantly, different polypeptide proteins are coded.

answers.yahoo.com/question/index?qid=20090112165544AAQqjCt

Is it possible to know the effects of a population bottleneck with Adam and Even and then the 2nd with Noah's family after the ark landed?

answers.yahoo.com/question/index?qid=20081108104904AA3HSdK

1) Sexual reproduction - causes variation because you create a new person by mixing the DNA of 2 unrelated individuals. 2) Independent segregation - When meiosis occurs to produce gametes, each gamete only gets one copy of each pair of homologous chromosomes and which one it gets is random with equal chance of getting either.

evolution.berkeley.edu/evolibrary/article/0_0_0/evo_16

However, natural selection and genetic drift cannot operate unless there is genetic variation — that is, unless some individuals are genetically different from others. If the population of beetles were 100% green, selection and drift would not have any effect because their genetic make-up could not change.

answers.yahoo.com/question/index?qid=20080929193225AApklRK

What are the 3 sources of genetic variation in sexually reproducing organism's? Explain how each one contributes to the genetic variability of organisms. Answer Save. 3 Answers. Relevance. ursaitaliano70. Lv 7. 1 decade ago. Favorite Answer. 1.Oogenesis - Random separation of alleles during meiosis.