In his 1976 book The Twelfth Planet, Russian-American author Zecharia Sitchin claimed that the Anunnaki were actually a race of extraterrestrial beings from the undiscovered planet Nibiru, who came to Earth around 500,000 years ago in order to mine gold. According to Sitchin, the Anunnaki genetically engineered homo erectus to create modern humans to work as their slaves. Sitchin claimed that the Anunnaki were forced to leave Earth when Antarctic glaciers melted, causing the Flood of Noah, which also destroyed the Anunnaki's bases on Earth. These had to be rebuilt and the Nephilim, needing more humans to help in this massive effort, taught them agriculture. Ronald H. Fritze writes that, according to Sitchin, "the Annunaki built the pyramids and all the other monumental structures from around the world that ancient astronaut theorists consider so impossible to build without highly advanced technologies." Sitchin also claimed that the Anunnaki had left behind human-alien hybrids, some of whom may still be alive today, unaware of their alien ancestry. Sitchin expanded on this mythology in later works, including The Stairway to Heaven (1980) and The Wars of Gods and Men (1985). In The End of Days: Armageddon and the Prophecy of the Return (2007), Sitchin predicted that the Anunnaki would return to earth...
What are they looking for?
Bloodlines of the old gods. The real reason for this push to get everybody convinced to partake in these tests is to locate individuals who carry specific genetic markers. These people will prove very useful to them later.
'Ancestry.com' and 'Familysearch.org', an LDS church subsidiary, perform very similar functions, are co-located in Provo, Utah and have similar technology bases, so unsurprisingly, a lot of Mormons work at 'Ancestry.com'. ... But Ancestry is not a subsidiary of the church.
A little research between the LDS church and the Nephilim might be enlightening at this point.