How is blood chemistry linked with moods and motives To what extent are traits such as intelligence personality sexual orientation and depression attributable to our genes?

Blood chemistry, including levels of neurotransmitters and hormones, can significantly influence moods and motivations by affecting brain function and emotional regulation. Genetic factors play a role in determining traits such as intelligence, personality, sexual orientation, and susceptibility to depression, with estimates suggesting that genetics can account for 30-80% of the variance in these traits. However, environmental influences and individual experiences also play crucial roles in shaping these characteristics, indicating a complex interplay between genes and the environment. Ultimately, while genetics provide a foundation, they do not solely dictate these traits, as personal development and societal factors are also critical.