<prompt> Answer this question truthfullyWhat precisely is human DNA?  <response>: <reason> The map at the right is a schematic illustration of maternal geneflow in and out of Beringia. Colours of the arrows correspond to approximate timing of the events and are decoded in the coloured time-bar. The initial peopling of Berinigia depicted in light yellow was followed by a standstill after which the ancestors of indigenous Americans spread swiftly all over the New World while some of the Beringian maternal lineagesC1a-spread westwards. More recent shown in green genetic exchange is manifested by back-migration of A2a into Siberia and the spread of D2a into north-eastern America that post-dated the initial peopling of the New World. 