Genetics
Variation in genetics is much studied because it results from a change in factors.
First, it is necessary to understand that the genotype is what is determined by the individual's genetic material and the phenotype is the manifestation of the characteristics that are described in the genotype, but that interact with the environment.
In this way, we can understand that all new alleles are the result of nucleotide variability.
Alleles are forms of a particular gene and nucleotides are sequences that are in DNA (each gene is composed of a sequence of nucleotides). Thus, if there is a change in the nucleotides, the alleles will also change.
Therefore, the answer is "all new alleles are the result of nucleotide variability", alternative "A".
