Identical twins share virtually all of their genes, and fraternal twins share about 50%. This makes twins ideal subjects for behavioral geneticists, since they can compare how each individual in a pair is influenced by genes, shared family environment, and individual experience. One of the pioneers of twin studies was 19th-century scientist Sir Francis Galton, who was influenced by the work of his cousin, Charles Darwin. What fundamental misconception colored the research of early twin scholars? Discuss