Behavior geneticists study the influence of genotype on human behavior by

Question

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Behavior geneticists study similarities among family members to understand the influence of genes on behavior. Family members share a proportion of genes, making it possible to estimate the genetic influence on certain behaviors.

Answer: D 
 Although selective-breeding experiments are more commonly used in animal behavior genetics, they can be used in human behavior genetics to understand how genetic traits may be passed down and affect behavior. However, these types of experiments are currently not ethical to conduct in humans.

Therefore, the best choice would be C as it is a commonly used method in behavior genetics research.

Behavior Geneticists Study the Influence of Genotype on Human Behavior