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When the population is small or When there is no gene flow Small population, germ line mutation, beneficial mutation that gets into many progeny and a good deal of luck.
If a mutation is present in a gamete, then the mutation will enter the population's gene pool. Once it is in the gene pool, natural selection and genetic drift will influence the frequency that the mutation appears in the population.
When the population is small or When there is no gene flow Small population, germ line mutation, beneficial mutation that gets into many progeny and a good deal of luck.
Mutation can create new alleles, therfore can change allele frequencies in a population.
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There is no gene flow - APEX
Yes, brand new genes can only come from mutation.
mutations, recombination, random pairing of gametes