Critics say that evolutionary psychology operates on hindsight bias they explain what we already know without predicting results. Explore how humans are different from one another. They recognize that both genes and current environment contribute to behavior. Their goal is to tease them apart. Fraternal twins develop from two separate eggs with two different sperm, so they can be the same or opposite sex, and they are no more similar than siblings.
Identical twins are more similar behaviorally than fraternal twins.
For example, if your identical twin divorces, you are more likely to divorce. To control for confounding effects of environment, we should compare twins that have been separated by circumstance since birth Separated identical twins are remarkably more similar than separated fraternal twins. Critics say that any 2 strangers will find many coincidental similarities. Alzheimer s is due to the deterioration of ACh neurons. Tangles form in the neuron, 2.