Sorry but truth never changes.
Sorry, but viruses don't mate and breed together. So flu vaccines aren't based on transferring genes via copulation as animals and humans breed offspring. so it's not evolution that leads scientists to invent vaccines. It's understanding how viruses react to outside stimuli.
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Woah. You really don't have a clue about how viruses or the immune system work, do you?
1) Attach to cell
2) insert genetic material
3) trick cell into making copies of the genetic material (mutations can be produced at this point) and the components needed for new viruses
4) the viruses assemble
5) the viruses leave the cell (often destructively)
If there is something in the body (say an antibody) that is not able to catch some of the offspring viruses' offspring (because they are different enough due to the mutation that the antibody doesn't recognize them) then evolution occurs by natural selection.
From Wikipedia, Viral Evolution:
"Changes may include point mutations or epistatic mutations, as well as genome rearrangements to genes and other functional gene sequences such as gene acquisition, gene creation and gene deletion as well as recombination and translocation events."
All of these types of changes have a potential to make a particular virus strain more suitable to live in a given environment.
Sorry but truth never changes.
Our perception of this truth changes based on how much we know about the truth, and thus theories about the truth can change even when the truth doesn't.
"Sorry, but viruses don't mate and breed together."
But they do do something broadly similar.
"Constraints to Genetic Exchange Support Gene Coadaptation in a Tripartite RNA Virus"
Fernando Escriu, Aurora Fraile and Fernando García-Arenal,
[i]PLoS Pathogens[/i], volume 3 number 1 .
Genetic exchange by recombination, or reassortment of genomic segments, has been shown to be an important process in RNA virus evolution, resulting often in important phenotypic changes affecting host range and virulence. [...] Genetic exchange is, with mutation, a primary source of genetic variation and plays an important role in virus evolution. Viruses possess mechanisms for genetic exchange that make their reproduction “just as sexual as that in eukaryotes”
Viruses aren't even alive to copulate with one-another.
Oh, it's just Carico. Never mind... Move along, move along, nothing to see here.
Confused?
So were we! You can find all of this, and more, on Fundies Say the Darndest Things!
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