ABCTE Science Practice Exam

Sexual reproduction plays a crucial role in the evolution of a species primarily by increasing genetic diversity among individuals. This increased genetic variation is generated through the combination of alleles when gametes (sperm and eggs) from two parents fuse during the fertilization process. Each parent contributes a unique set of genes, which leads to offspring that are genetically distinct from both parents as well as from each other.

This genetic diversity is vital for the process of natural selection. When environmental conditions change or new challenges arise, such as diseases or shifting climates, a diverse gene pool ensures that some individuals may possess traits that confer a survival advantage. These individuals are more likely to reproduce and pass those advantageous traits on to the next generation, thereby facilitating the adaptation of the species over time.

In contrast, the option that suggests producing identical offspring does not contribute to evolutionary change, as it leads to uniformity rather than diversity. The notion that sexual reproduction does not affect evolution overlooks the impact of genetic variation on the adaptability of populations. Lastly, while ensuring a high rate of reproductive success is beneficial, it is the variability in the offspring that ultimately drives evolutionary processes, rather than solely a high rate of reproduction.