In the Chinese calendar, the days begin at midnight and end at the next midnight, but people tend to regard the days as beginning at dawn. Currently, the time in days are scaled with hour-minute-second system. In ancient China, the time is divided according to either the shi-shÃ­ ke kÃ¨-and gÄng. diÇn systems
maternal lineage, or 2) Y-chromosome DNA which is inherited through the fatherâs line and is. passed down only to males in each generation and can give information only to males about his. paternal lineage. The other type of genetic ancestry test is one that makes estimates of a personâs ancestry by.
Until a few years ago, most ancestry tests for individuals relied on short stretches of DNA in cell-powering organelles called mitochondria, which are inherited through the mother, or on the Y chromosome, which a father passes down to his sons.