Behavioral Genetics

Behavioral Genetics

Definition of Behavioral Genetics

• Behavioral Genetics: A field of study examining how genes and experience influence the diversity of human traits, abilities, and behaviors.
  • Key Question: What portion of behavior is due to genetics (nature) vs. environment (nurture)?

Heritability

• Heritability: A measure of how much variation in a trait can be attributed to genetics.
  • Focuses on the proportion of a trait linked to one's genes.
  • Citation: (Kuther, 2023, p. 68)

Estimating Genetic and Environmental Influence

• Kinship Studies: Research comparing family members (especially identical twins) to assess heredity’s role in complex human traits.
  • Citation: (Berk, 2013, p. 120)

Twin Studies

• IQ Score Comparisons:

  Type of Twins/Relatives	Reared Together	Reared Apart
  Identical Twins	0.86	0.72
  Fraternal Twins	0.60	0.52
  Biological Siblings	0.47	0.24
  Biological Parent & Child	0.42	0.22
  Adopted Parent & Adopted Child	0.19	--

  • Citation: (Kuther, 2023, p. 69)

Concordance Rates of Disorders

• Concordance Rates for various traits:

  Trait	Identical Twins	Fraternal Twins
  Schizophrenia	72%	18%
  Severe Depression	69.2%	25%
  Delinquency and Criminality	87%	80%

  • Demonstrates genetic influence on psychological traits.

Gene-Environment Interactions

• Range of Reaction: Genetic traits can express widely based on environmental factors.
• Canalization: Genetic heredity can restrict development outcomes to a few options, with traits expressed only under specific conditions.
• Niche-Picking: Individuals seek environments that resonate with their genetic predispositions.
• Evocative Genotype: The interaction between genetically influenced behaviors and the reactions they elicit from others.
  • Citation: (Kuther, 2023, pp. 69-71)

Relationship Between Genetics and Environment

• An individual’s genetics influence their choice of environments that reinforce their genetic traits and behaviors.
• Environmental factors (such as parents, teachers, peers, and culture) respond to a child's genetic characteristics.

Insights on Feelings and Agency

• Quote: "Some feelings are inborn, others arise from mortal experiences, and others emerge from the interaction of nature and nurture."
  • Emphasis on the distinction between feelings influenced by genetics and those shaped by life experiences.
• Agency: The fundamental ability to act independently—our capacity for choice is a gift from God, reflecting our accountability.
  • Citation: Elder Oaks, Ensign, October, 1995.

Protective and Risk Factors

• Protective Factors: Characteristics that lower the likelihood of negative outcomes; may come from biological, psychological, familial, or community levels.
• Risk Factors: Traits preceding and associated with an increased likelihood of negative outcomes occurring.
  • Citation: U.S. Department of Health and Human Services, SAMHSA (2009).

Understanding Risk and Protective Factors

• “Swamping Conditions”: Concentrated positive conditions (like high socioeconomic status) may enhance development, while concentrated disadvantages may hinder it.
  • Citation: Horowitz, F. D. (2000).

Importance of Understanding Nature and Nurture

• Grasping the complexity allows for better empathy and compassion, understanding that experiences vary greatly between individuals.
• Acknowledging different perspectives can empower better decision-making for individuals and communities, especially in stewardship roles.