Final answer:
Intelligence is influenced by a combination of genetics and environmental factors. It is not a simple Mendelian trait, nor exclusively determined by genetic or environmental factors alone.
Step-by-step explanation:
The influence on intelligence is a topic that encompasses both genetics and the environment. While genetic factors do play a significant role, environmental factors also have a profound impact on an individual's intellectual development. Studies like the Minnesota Study of Twins Reared Apart have shown that there is a considerable genetic component to intelligence. However, environmental factors such as intellectual stimulation during childhood can considerably affect cognitive abilities. Intelligence is therefore not a Mendelian trait with a simple inheritance pattern nor is it influenced solely by genetics or environment alone.
When addressing the question, the accurate statement that reflects the influences on intelligence is that intelligence is influenced by both genetic and environmental factors.