Which mechanism is NOT part of the evolutionary synthesis?

The correct choice, which identifies a mechanism that is not part of the evolutionary synthesis, is based on the understanding of how evolution is described in this context. The evolutionary synthesis, also known as the modern synthesis, integrates various biological theories and concepts, primarily focusing on the genetic basis of evolution and the mechanisms that drive changes in populations over time.

Natural selection, genetic drift, and gene flow are all established mechanisms of evolution. Natural selection refers to the process where individuals with advantageous traits are more likely to survive and reproduce, thereby passing those traits to the next generation. Genetic drift involves random changes in allele frequencies in a population, which can lead to significant evolutionary changes over time, especially in small populations. Gene flow refers to the transfer of genetic material between populations, which can introduce new genetic variation and alter allele frequencies.

Behavioral adaptation, while referring to changes in behavior that may evolve in response to environmental pressures, is not considered one of the primary mechanisms of evolution in the same way as the other three. Instead, behavioral adaptations are often a result of the evolutionary processes driven by natural selection or other mechanisms. Therefore, it does not fit into the framework of the evolutionary synthesis as a primary mechanism of evolution.

In summary, the distinction comes from recognizing that