The experiments with glowing fruit flies demonstrated that
A) cultures of isolated fruit fly body parts, such as the head or thorax, did not glow rhythmically.
B) rhythmic per gene activity will synchronize with light-dark cycles, but cannot, by itself, maintain a free-running period length.
C) the glow rhythms continued in constant darkness with a free-running period length.
D) the thorax was the only body part in which the clocks remained synchronized in the prolonged absence of light.

Question

Quizplus · Accepted Answer

The experiments showed that the glow rhythms, which are indicative of the per gene activity, continued even in constant darkness, demonstrating the ability of the internal clock to maintain a free-running period length without external cues.

The Experiments with Glowing Fruit Flies Demonstrated That