DNA methylation is used in some genes to differentiate which gene copy is inherited from the father and which gene copy is inherited from the mother, a phenomenon known as imprinting. Histones are proteins that are the primary components of chromatin, which is the complex of DNA and proteins that makes up chromosomes.his is the type of epigenetic change that is responsible for the inactivated X chromosome of females. In contrast, methylation of a different lysine (K4) on the same histone (H3) is a marker for active genes (Egger et al ., 2004).
Perceptual adaptation is a phenomenon that occurs for all of the senses, including smell and touch. An individual can adapt to a certain smell with time.
Perceptual psychology is a subfield of cognitive psychology that is concerned specifically with the pre-conscious innate aspects of the human cognitive system: perception.Perceptual psychology is a branch of cognitive psychology dealing with mental processes that we use in everyday living.Any time you problem-solve, make a decision or make a memory you are using an example of perceptual psychology.erceptual psychology is a branch of cognitive psychology dealing with mental processes that we use in everyday living. Any time you problem-solve, make a decision or make a memory you are using an example of perceptual psychology.