Which of the following does not characterize a free-running circadian rhythm?
A) If the period is less than 24 hours, the animal begins its activity a little later each day.
B) Its period is under genetic control.
C) It occurs under constant environmental conditions.
D) Its clock runs according to its natural period.
E) Mutations can create differences in period lengths within a species.

Question

Quizplus · Accepted Answer

A free-running circadian rhythm is characterized by its ability to run in the absence of external cues, maintaining a period that is close to, but not exactly, 24 hours. If the period is less than 24 hours, the animal would actually begin its activity a little earlier each day, not later, as it cycles faster than the earth's 24-hour day.

Which of the Following Does Not Characterize a Free-Running Circadian