Based on what is known about the heritabilities of mild and profound forms of intellectual disability, you would expect the siblings of mildly intellectually disabled children to have ___________ IQs and the siblings of profoundly intellectually disabled children to have ___________ IQs.
A)average; lower than average
B)lower than average; average
C)higher than average; average
D)average; higher than average

Question

Quizplus · Accepted Answer

Mild intellectual disability often has a stronger environmental component, so siblings may also be affected, leading to lower than average IQs. Profound intellectual disability is more often due to specific genetic or biological factors, so siblings are less likely to be affected, resulting in average IQs.

Based on What Is Known About the Heritabilities of Mild