Question

25 mark for review which of the following statements explains why it is difficult to experiment with human development? a the genes of identical twins are not similar enough for statistics. b direct long - term manipulation of a child’s environment would be unethical. c experiments with small children are always unethical. d identifying what genetic traits are interacting with the environment is impossible.

Explanation:

• Option A is incorrect because identical twins have nearly identical genes, which are suitable for statistical analysis in studies.
• Option B is correct. Manipulating a child’s environment long - term for experimental purposes would violate ethical standards (e.g., informed consent, potential harm to the child’s development), making human development experiments difficult.
• Option C is incorrect as not all experiments with small children are unethical (e.g., observational studies with proper safeguards).
• Option D is incorrect as it is possible to study gene - environment interactions through methods like twin studies, adoption studies, etc.

Answer:

B. Direct long - term manipulation of a child’s environment would be unethical.