Evidence that sleep has an inherited component is that
A)MZ twins share more sleep characteristics than do DZ twins.
B)siblings often go to sleep and wake up at the same time.
C)people with insomnia have the same chromosome abnormality.
D)DZ twins share more sleep characteristics than do MZ twins.

Question

Quizplus · Accepted Answer

MZ (monozygotic) twins share all their genes, while DZ (dizygotic) twins share around 50% of their genes. If sleep habits were purely environmental, then DZ twins should share similar sleep habits to the same extent as MZ twins. However, studies have shown that MZ twins share more sleep characteristics than do DZ twins, suggesting that there is some genetic component to sleep patterns.

Evidence That Sleep Has an Inherited Component Is That