What is a primary factor that influences the onset of puberty in adolescents?

The onset of puberty in adolescents is primarily influenced by genetics. This is because the timing of puberty is strongly determined by hereditary factors passed down from parents to their children. Research has shown that genetic factors play a significant role in establishing the timing of physiological changes during adolescence, including the onset of secondary sexual characteristics and the growth spurt associated with puberty.

While other factors such as environmental stressors, socioeconomic status, and nutrition can impact development, their roles are often secondary to genetic predispositions. For instance, while nutrition can affect growth and overall health, and increase or decrease the onset of certain developmental stages, it cannot override the genetic timetable that dictates when an individual will enter puberty. Understanding this genetic basis is essential for recognizing that puberty is a complex biological process influenced primarily by inherited traits.