what are some common methods used to study genetic influences on behavior

ATI RN

Psychology 2301 Exam 1

1. What are some common methods used to study genetic influences on behavior?

A. Genetic influences are studied only through twin studies.
B. Common methods include twin studies, adoption studies, and gene mapping.
C. Genetic influences on behavior are only studied through family history.
D. Genetic influences on behavior are not well understood.

Correct answer: B

Rationale: Common methods used to study genetic influences on behavior include twin studies, adoption studies, and gene mapping. Twin studies help to compare the similarities between identical and fraternal twins to estimate the heritability of a trait. Adoption studies look at the similarities between adopted children and their biological and adoptive parents to determine genetic influences. Gene mapping involves identifying specific genes associated with certain behaviors. Choices A, C, and D are incorrect because genetic influences on behavior are not solely studied through twin studies or family history, and while the understanding of genetic influences may vary, there are established methods to study them.

2. Which disorder is characterized by a pattern of behavior that involves culturally inappropriate, overly familiar behavior with relative strangers?

A. Schizoid personality disorder
B. Autism spectrum disorder
C. Reactive attachment disorder
D. Disinhibited social engagement disorder

Correct answer: D

Rationale: Disinhibited social engagement disorder is the correct answer because it is characterized by a pattern of behavior involving culturally inappropriate and overly familiar behavior with relative strangers. This disorder is marked by a lack of social boundaries and caution when interacting with unfamiliar individuals. Schizoid personality disorder (Choice A) is characterized by a lack of interest in social relationships, Autism spectrum disorder (Choice B) involves challenges with social interactions and communication, and Reactive attachment disorder (Choice C) is typically associated with difficulty forming emotional bonds with caregivers, not with overly familiar behavior with strangers.

3. Normal human cells have ________.

A. twenty-two chromosome pairs and one pair of sex chromosomes.
B. twenty-one trisomy chromosome pairs, one autosomal pair, and one pair of sex chromosomes.
C. twenty-one chromosome pairs and two trisomy chromosome pairs.
D. twenty-three chromosome pairs.

Correct answer: A

Rationale: The correct answer is A. Normal human cells have twenty-two chromosome pairs and one pair of sex chromosomes. This adds up to a total of 46 chromosomes. Choice B is incorrect as it mentions twenty-one trisomy chromosome pairs, which is not a characteristic of normal human cells. Choice C is also incorrect as it states twenty-one chromosome pairs and two trisomy chromosome pairs, which is not accurate for normal human cells. Choice D is incorrect as it mentions twenty-three chromosome pairs, which is not the correct number for normal human cells.

4. Undercontrolled behavior tends to be seen in American children, whereas overcontrolled behavior is seen in Thai children.

A. Aggressive behavior; calm behavior
B. Overcontrolled behavior; undercontrolled behavior
C. Undercontrolled behavior; overcontrolled behavior
D. Equal behavioral traits in both cultures.

Correct answer: C

Rationale: The correct answer is C: 'Undercontrolled behavior; overcontrolled behavior.' The question highlights a cultural difference in behavior tendencies between American and Thai children. American children are usually characterized by undercontrolled behavior, while Thai children tend to exhibit overcontrolled behavior. Choice A (Aggressive behavior; calm behavior) is incorrect as the question does not mention aggressive or calm behavior as the contrasting traits between the two groups. Choice B (Overcontrolled behavior; undercontrolled behavior) is incorrect because the described behavior patterns are reversed based on the question's context. Choice D (Equal behavioral traits in both cultures) is incorrect as the question explicitly states differing behavior patterns in American and Thai children.

5. If a pair of monozygotic twins raised in the same environment end up being different from one another (e.g., interests, hobbies, etc.), it is highly likely due to:

A. Cephalocaudal pattern
B. Proximodistal pattern
C. Cephamodistal pattern
D. Gene-environment correlation

Correct answer: B

Rationale: The correct answer is B: Proximodistal pattern. Differences between monozygotic twins raised in the same environment are likely due to non-shared environmental influences, which lead to differences in interests, hobbies, and other individual characteristics. Choices A, C, and D are incorrect. Cephalocaudal pattern refers to the principle of development from head to toe, not relevant in explaining differences between twins. Cephamodistal pattern is not a recognized developmental term. Gene-environment correlation does not directly explain the differences between identical twins raised in the same environment.