生物時計（biological clock）とは、生物が生まれつきそなえていると考えられる時間測定機構。体内時計、生理時計（physiolosical clock）とも言う。生物の睡眠や行動の周期に影響を与える。哺乳類では脳の視交叉上核によるとみなされている。 ** Biological clock may refer to: Age and female fertility, decrease of female fertility with advancing maternal age Ageing, biological program that limits the lifespan of an individual Circadian clock, a molecular mechanism that results in a circadian rhythm in a living organism Circadian rhythm, biological process that displays an oscillation about 24 hours, such as the human sleep-wake cycle (the “body clock”) Epigenetic clock, a set of DNA sites whose methylation levels can be used to measure aging throughout the body Molecular clock, a technique that uses the mutation rate of a biomolecule to deduce the time in prehistory when two life forms diverged Vernalisation, the … Continue reading ウィキペディア, Wikipedia