Evidence That Sleep Has an Inherited Component is That

Question

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) students living in dorms develop the same sleeping habits.
D) people with insomnia have the same chromosome abnormality.
E) DZ twins share more sleep characteristics than do MZ twins.

Accepted Answer

MZ twins share all their genes, while DZ twins only share about 50% of their genes. If sleep has an inherited component, we would expect MZ twins to have more similar sleep characteristics than DZ twins, which is supported by research.