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This paper reviews selected biological correlates and determinants of chronotype. The diurnal types are known to differ in some parameters (mainly acrophase and nadir) of many physiological circadian rhythms such as body temperature, melatonin and cortisol secretion and cardiovascular system activity. These various characteristics of circadian rhythms reflect differences between time-of-day dependent...
The main goal of this paper was to present methods, which have been applied to localize and identify genes related to individual differences in behavior and other complex traits. Both linkage analysis (parametric and non-parametric) and association approach are discussed using examples of studies, in which said methods have been employed. The paper ends with a short review of molecular genetic techniques...
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