Y-DNA Haplogroup:
The male Y chromosome is passed from father to son as a complete and exact copy, with the exception of random mutations. Because of this exact copy and misprint occurrence, we can track direct patrilineal descent and migration for potentially millions of years.
New haplogroups/ subclades are defined by new mutations (misprints) in the Y chromosome, which all descendants will retain. They cannot be mixed and are exact copies of the last misprint.

Given this information and tools to map such division, you can actually print the division of modern races very cleanly. Here I've put together a map based on the hominid cline chart I previously made, which demonstrates what I present regarding the isolated Caucasian cline as accurate.

—Iberomaurusian's "ANA" is simply more archaic pre-Basal Eurasian ancestry.
—Dzudzuana's "Basal Eurasian" is simply more archaic initial Basal Eurasian ancestry.
—Ancient North Eurasian's "East Eurasian" is simply eastern drifted Basal Eurasian ancestry.