The albinos mingled with the existing inhabitants of the new lands they settled in.
The existing inhabitants of those new lands were a mixture of Asian and a 3rd mysterious dna, belonging to an alien species.
In the Bible, two different type of humans were created. The first human was a savage. He was put outside of the Garden of Eden. The 2nd human, commonly known as Adam, was special. He was put in the Garden of Eden. When time came for him to have a woman, god created a woman, not from the existing pool of humans that were outside the garden. But god took a specific step. He created for Adam a woman like him. Giving away his intention to ensure the blessed can always be distinguished from the others.