Asked by: Yurany Etxeandiaasked in category: General Last Updated: 5th February, 2020
Where does variation in DNA come from?
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Also to know is, where does the variation of DNA sequences come from?
Mutations and recombination are major sources of variation. Mutations are the original source of genetic variation. A mutation is a permanent alteration to a DNA sequence. De novo (new) mutations occur when there is an error during DNA replication that is not corrected by DNA repair enzymes.
Furthermore, what is DNA variation? 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 them is called variation.
Similarly one may ask, 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 the 5 sources of genetic variation?
- random mating between organisms.
- random fertilization.
- crossing over (or recombination) between chromatids of homologous chromosomes during meiosis.