Genetics and Twins

Genetics and Behavior

Question 17

• The question addresses the relationship between genes, environments, and behavior.
• Option A suggests that both genes and environments always affect behavior.
• Option B suggests that genes play a larger role in behavior.
• Option C states that identical twins always look alike.
• Option D says that environments play a larger role than genes in influencing behavior.

Question 18

• The question asks about a true statement regarding twins.
• Option A states that twins are hereditarily not the same.
• Option B says that twins never have the same characteristics.
• Option C suggests twins result from two eggs fertilised at once.
• Option D states that twins show a 20% difference in weight at most.