Which of the following concepts focuses on genetic contributions to future generations?

The concept that focuses on genetic contributions to future generations is fitness. In evolutionary biology, fitness refers to an organism's ability to survive and reproduce in its environment. The organisms that successfully pass their genes to the next generation are considered to have higher fitness. This concept encompasses not just survival but also the overall reproductive success of an organism, thereby directly influencing the genetic makeup of future generations.

While evolutionary pressure, natural selection, and species diversity are related concepts in the study of evolution, they do not specifically focus on the genetic contributions of individual organisms to future generations as fitness does. Evolutionary pressure refers to the environmental factors that influence which traits are advantageous, natural selection is the mechanism by which these advantageous traits become more common in a population, and species diversity pertains to the variety of species within an ecosystem. Each of these concepts plays a role in the broader framework of evolution, but fitness specifically addresses the reproductive aspect that ensures genetic continuity.