Answer:
changes in genes
Explanation:
The correct answer would be changes in genes.
Variation refers to differences among living organisms of the same species. Variation in a population can be from 3 sources:
- mutation
- recombination
- genetic drifts
A mutation refers to a sudden change in the DNA sequence of a gene. When a gene changes, new alleles are introduced into the gene pool and this creates variation within the population.
Recombination of genes arises from random mating/fertilization during sexual reproduction. Gamete formation results in gene recombination.
Genetic drifts refer to the changes to the alleles of the gene pool as a result of chance events. These changes further introduce variation into the population.
Hence, the correct answer among the options is changes in genes, also known as mutation.
