Question

multiple choice question
new mutations are not a major factor affecting the allele frequencies in a population because

individuals who harbor new mutations are rapidly eliminated from the population by selection
the number of alleles in a population is very high
the rate at which new mutations occur is low

Explanation:

New mutations have a minimal impact on allele frequencies mainly due to their low - occurrence rate. Selection doesn't always rapidly eliminate mutants, and a high number of alleles isn't the main reason for new mutations not affecting frequencies.

Answer:

the rate at which new mutations occur is low