Genesis Dalek

The Genesis Daleks were the original faction of Daleks who were created by Davros. (TV: Genesis of the Daleks)

Characteristics
The Genesis Daleks inhabited the first Mark III Travel Machines created by Davros. Identified by the Fourth Doctor as "very primitive but undeniably a Dalek", these casings were mostly grey with sense globes coloured black (TV: Genesis of the Daleks) rather than the "low-frequency" blue which the Time Lords associated with the Daleks' "early period". (PROSE: Dalek Combat Training Manual)

Legacy
According to one account, Davros's Daleks led by the Dalek Prime ultimately emerged from their entombment and forced the Thals to evacuate Skaro. By this account, it was this faction of Daleks which established the Dalek Empire. (PROSE: The History of the Daleks)

Behind the scenes

 * According to The Discontinuity Guide, the more advanced Daleks took to space to escape the neutron bomb whist the Skaro City Daleks, who were the early products of the experimental program conducted by the late Davros, were left behind on SKaro. These primitive Daleks were all wiped out in the battle with the Thals, though the advanced Daleks would later return to make their home on Skaro, preceding the Dalek Civil War which took place somewhere between the 19th century and the mid-22nd century. It is further noted that, since the Fourth Doctor inadvertently changed Dalek history so that Davros survived, this event would have occurred vastly differently if it happened at all in the new timeline.
 * The Genesis Daleks were named in issue 39 of Doctor Who: Figurine Collection.