Origin of Biochirality and Carbon Isotopic Record

The origin of biochirality is a result of combined action of many factors.The main events are :1) The left right asymmetrical effects induced by inelastic scattering of beta electrons with chiral molecules;2) The chirality amplification by chemical reaction dynamics if along some optimal and elaborately designed pathway;3) The chirality amplification by polymerization process in low temperature.In addition to the possibility of primitive life formed from the chiral pure molecules,we advance alternatively that the chirality evolution is completed after primitive life has emerged,and the impure chirality of primitive organism is related to its lower efficiency of photosynthesis and can be manifested through carbon isotopic record.