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.

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.

Correct Answer: D

Rationale: Genes determine the range of characteristics a person has. This is the correct answer because genes contribute to a variety of traits and characteristics a person may have, influencing physical attributes, predispositions to certain conditions, and more. Choice A is incorrect because behavior is influenced by a combination of genetic and environmental factors. Choice B is incorrect because mental disorders are complex conditions influenced by various factors beyond just genes. Choice C is incorrect because genes do not solely determine all characteristics a person will have, as environmental factors also play a significant role.

Correct Answer: B

Rationale: The correct answer is B. Defense mechanisms contribute to psychopathology by allowing individuals to avoid confronting painful realities. This avoidance can prevent individuals from dealing with underlying issues, leading to the development or exacerbation of psychopathological conditions. Choice A is incorrect because while defense mechanisms may serve as coping mechanisms, they can also contribute to psychopathology when used excessively or inappropriately. Choice C is incorrect as defense mechanisms are indeed connected to psychopathology. Choice D is incorrect because defense mechanisms, when maladaptive, can contribute to psychopathology rather than being considered healthy coping strategies.

Correct Answer: A

Rationale: Overly aggressive behavior is often a major factor in a child's rejection by peers. Children who display overly aggressive behavior may intimidate or harm their peers, leading to social rejection. Being too intelligent or having a different socioeconomic background are not typically primary reasons for peer rejection. While empathy is important for healthy social interactions, a lack of empathy, on its own, is less likely to be a primary factor in peer rejection compared to overly aggressive behavior.