The meaning of EPIGENESIS is development of a plant or animal from an egg or spore through a series of processes in which unorganized cell masses differentiate into organs and organ systems; also : the theory that plant and animal development proceeds in
19.A more intriguing possibility, though, is that the relevant genes are affected by epigenesis, a process in which chemicals attached to the DNA control its activity. 然而,一个更有意思的可能性是后生作用影响了这些基因。后生作用是指与DNA相接的化学物质来控制其活动。
This may not come as a surprise as each time-dependent process, in particular each developmental process, can be conceived of as the output of some dynamic system. Hence, mathematical systems theory is of direct importance to developmental theory. In Section 2 we will present a heuristic sketch...
extending over more than 200 passages, of refractoriness to transformation; and the third stage (which probably arose by mutation) in which there is a consistent transformation-related response by the entire population to growth constraint, a response which has remained relatively constant over some ...
languageshave CVsyllables,fewallowCCVC;also,phonemestendtobeorderedinorderofincreasingsonorityuntilthe peaksofsyllables,andtheninorderofdecreasingsonority. Whyisthisso?Severalanswershavebeenproposed.Ontheonehand,theChomskianpost-structuralist pointofviewexplainsthesestructuresbyanumberofformalrules,whichcanbe...
extending over more than 200 passages, of refractoriness to transformation; and the third stage (which probably arose by mutation) in which there is a consistent transformation-related response by the entire population to growth constraint, a response which has remained relatively constant over some ...