Dr. Anderson is researching motor skill development in identical and fraternal twin infants. What would his hypothesis be based on what we know about motor skill development?
A) Fraternal twins will share more similarities in the timing and pace of motor development than identical twins.
B) Both identical and fraternal twins will share the same similarities in the timing and pace of motor development.
C) Twins will be no more likely to be similar in the timing and pace of motor development than siblings spaced apart in age.
D) Identical twins will share more similarities in the timing and pace of motor development than fraternal twins.

Question

Quizplus · Accepted Answer

Identical twins share the same genetic makeup, while fraternal twins do not. Therefore, if genes play a role in motor skill development, Dr. Anderson's hypothesis would be that identical twins would share more similarities in the timing and pace of motor development than fraternal twins.

Dr Anderson Is Researching Motor Skill Development in Identical and Fraternal