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Traits
Traits are characteristics of an individual that are at least partially controlled by genes. While commonly associated with observable physical attributes like eye or hair color, the concept of traits also extends to non-physical characteristics, including behavioral patterns, personality, and temperament. The complete set of an individual's observable traits, both physical and behavioral, constitutes their phenotype.
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Psychology
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Fertilization
Human Fertilization Process
Traits
Consider two isolated populations of a species. Population A exhibits a wide range of genetic differences among its members, while the individuals in Population B are genetically very similar to each other. If a novel and deadly disease emerges and spreads to both populations, which of the following outcomes is the most probable, and what is the underlying reason?
A researcher is comparing two pairs of siblings to understand the biological basis for differences in their psychological traits. Pair A consists of identical twins, who developed from a single fertilized egg. Pair B consists of non-identical (fraternal) siblings, who developed from two separate fertilized eggs. Why would the researcher expect to find a greater degree of genetic variation between the two individuals in Pair B compared to Pair A?
Chromosome
NR3C1 Gene
Gene therapy
Polygenic
Traits
Two identical twins, who share the exact same genetic makeup, were separated at birth and raised in significantly different environments. As adults, Twin A is outgoing and confident, while Twin B is shy and anxious. Based on the modern understanding of how genes influence traits, what is the most likely explanation for this difference in their psychological characteristics?
Analysis of Twin Outcomes
Alleles
Mutation
Learn After
Phenotype
Monogenic Traits
A researcher observes that a child has the same distinctive eye color as their biological mother. The researcher also notes that the child has the same favorite food—pizza—as their mother. Based on the definition of a trait as a characteristic at least partially controlled by genes, which statement provides the best analysis of these observations?
A researcher is studying why some individuals are consistently more outgoing and sociable than others at social gatherings. The researcher hypothesizes that this tendency is not just a learned habit, but may be partially inherited. Which of the following statements best justifies investigating this social tendency as a potential trait?