Final answer:
Changes in microsatellites, mutations, and exon shuffling are sources of genetic variation, contributing to the genetic diversity necessary for species survival and adaptation. Genetic drift affects allele frequencies but does not introduce new genetic variation.
Step-by-step explanation:
The sources of genetic variation are critical for the survival and evolution of species. Genetic variation refers to the differences in genetic makeup among individuals within a population, and it is important for adapting to changing environments and reducing the likelihood of adverse effects from harmful mutations. Let's explore the options given to identify sources of genetic variation:
Based on the information, options A (Changes in microsatellites), B (Mutations), and D (Exon shuffling) can be considered sources of genetic variation. Genetic drift, as mentioned in option C, does not introduce new variation but affects the frequencies of existing variation.