If SCN tissue is transplanted from a short-period hamster into a normal hamster,
A) no change can be observed.
B) the normal hamster will show 20-hour cycles.
C) the normal hamster will show 24-hour cycles.
D) the normal hamster will show 25-hour cycles.

Question

Quizplus · Accepted Answer

The SCN (suprachiasmatic nucleus) is responsible for controlling circadian rhythms in mammals. When SCN tissue from a short-period hamster (which has a circadian rhythm shorter than 24 hours) is transplanted into a normal hamster, the recipient's circadian rhythm will adjust to match that of the donor's, hence showing 20-hour cycles.

If SCN Tissue Is Transplanted from a Short-Period Hamster into a Normal