why mutation is the only way to producing new alleles?

[2810712]

I think, mutations are sudden changes but recombination in bacts are slower changes in DNA
but still they can produce new alleles , so mut. is not the only way.
Also, virulli infections are rare so they are not the natural means of allele-production.
But, why did you choose gametes as the targets ? ? ? They can introduce gnechanges in normal cells also... I think.

hrushikesh

[Poison]

but still they can produce new alleles , so mut. is not the only way.

we were talking about human. you are right about bacteria.