Dominant-Recessive genes principle: Dominant gene overrides the recessive gene.

Polygenic Inheritance: Multiple genes influence a single behavior.

Molecular Genetics: Manipulate genes to determine their effects on behavior.

Genome-wide Association Method: Identify genetic variations for a disease.

• Analyze individuals who have/don't have the disease.

Linkage Analysis: Link between neighboring genes, identify location of certain genes from known genes.

Selective Breeding: Organisms chosen for reproduction based on particular traits.

Behavior Genetics: Examine the extent of heredity's influence on behavior.

• Twin study: Identical Twins - Single fertilized egg, Fraternal Twins: Two separate eggs/sperms
• Identical twins more similar than fraternal twins.

Genotype: A person's genetic heritage.

Phenotype: A person's observable characteristics.

Genetic Expression: Whether a gene is enabled

CRISPR (clustered regularly interspaced short palindromic repeats):

• Snippets of harmful viruses' DNA and snips DNA
• Can be used to modify genomes of animals and humans by modifying DNA.