If the mother had had an affair with the King of Norway, on top of a Swiss Alp, while listening to Abba and eating lutefisk, the baby would not be that white. Heck, if I had an affair with the King of Norway, the baby would probably not be that white, but it would have a bigger nose.
This is a not-unheard-of spontaneous mutation. Every couple of years, I see a newspaper article about a couple who are African, but have a baby that looks white, but not albino, just pink and blonde, or with light brown hair.
I know someone who is technically a geneticist, but works mostly with insects, so not an expert on humans, who nonetheless commented that Caucasians probably arose in a few generations, rather than gradually by degrees, when a small group of Africans with a tendency to produce this mutation moved really far North, and what would be a drawback near the equator was an advantage, and the mutation became the dominant form. Some of those people moved back South, and mixed with more groups coming North, which is why you have the clear gradation of skin and hair color going from South to North in Europe.
Try Googling “African couple has white baby,” or something, and lots of articles pop up, most claiming this is very rare or even unique, while the number of articles show that it’s unusual, but very far from unique.
It probably happens to African Americans, and African Europeans, who have known Caucasian ancestry, but people don’t realize it’s a mutation, and think it’s just recessive genes popping up.
When I was in AIT (one stage of military training), there was a woman who probably had this mutation. She had sort of auburn hair, and really pale skin, with freckles, and blue eyes. She was clearly not an albino, but she have pretty pale skin, with African American features. She showed me a picture of her parents, and they just looked black-- they were biracial, or at least, that word didn’t come to mind. She said she was blonde as a little kid, but her hair got darker as she got older.
