Over generations,the relative proportions of alleles in a population changes according to the varying reproductive success of individuals with that population.So,by definition,it can be said that individuals with more reproductive success are better adapted to their environment.

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This is the basic principle of natural selection, which drives the evolution of populations over time. Individuals with traits that enhance their reproductive success, such as increased fertility, survival, and/or attractiveness to mates, will be more likely to pass on their genes to the next generation. As a result, the frequencies of these advantageous alleles will increase in the population over time, while the frequencies of less advantageous or deleterious alleles will decrease. Therefore, natural selection is a major mechanism that can lead to adaptation of organisms to their environment through the process of evolution.

Over Generations,the Relative Proportions of Alleles in a Population Changes