Question

Which is the only mechanism that can introduce new alleles in a gene pool?

Answer 1

The only mechanism which can introduce new alleles in a gene pool is mutations. A gene pool is all the alleles of the genes within a interbreeding population. Mutations is the changing or variation of the structure of a gene which results in new alternated alleles and this mechanism is that introduces new alleles in a gene pool.

Answer 2

i agree with @alif

Answer 3

crossing over,which leads to recombinations during meiosis and introduces new alleles in a gene pool