Final answer:
Joe is curious about how genes affect intelligence. Genes play a significant role in determining an individual's intelligence. However, intelligence is also influenced by environmental factors.
Step-by-step explanation:
Joe is curious about how genes affect intelligence. Genes play a significant role in determining an individual's intelligence. Certain genes can influence cognitive abilities, memory, and learning capacity. However, it's important to note that intelligence is also influenced by environmental factors, such as education and upbringing.