Final answer:
Phenotypic variations arise from genetic and environmental factors, with genetic variations being heritable and subject to natural selection.
Explanation:
Phenotypic variations first occur due to a combination of genetic and environmental factors. Genetic variation, influenced by different alleles, plays a crucial role in determining phenotypic differences among individuals in a population. Environmental factors can also contribute to phenotypic variation, but only genetic differences can be passed on to offspring and act as targets for natural selection.
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