Natural mutations...the driver of evolution.
''It is a wonderful example of the “
Aliens of the Gaps” argument – a variation of the “God of the Gaps” argument used by creationists where a phenomenon is credited to a deity if there is no agreed explanation for it.
Although this claim lacks any actual evidence, it is presented as an intriguing possibility through a typical rhetorical sleight of hand. This involves meshing the views of scientists and other experts with non-experts in a way that makes them look like they are all contributing to the same conversation.
In this instance, a professor of Anthropology provides a brief overview of the science behind rhesus-negative blood but is then sidelined by authors of alien-related ideas who add their own spin to the discussion without challenge. The effect makes it look like the viewer is watching a discussion of equally valid perspectives.
At the moment, there is no clear consensus on why some people are Rh-positive and others are not. As mentioned above, Rh-negative blood is quite
rare – around 15 percent of Caucasians are negative, while only 8 percent of Black people and only 1 percent of Asians are. But before we try to squish aliens into this explanatory gap, there are some simpler, albeit less sensational, explanations worth considering first, and they all have to do with genes, which are prone to mutating
naturally.
A good example here is eye color. Originally, human eyes were brown, but around 6,000 to 10,000 years ago a genetic mutation slipped in which turned off the ability to produce enough melanin to sustain this color in some people. This led to the emergence of other colors such as blue, green, and hazel eyes. The eye color is not the result of a particular pigment but rather the relative absence of higher concentrations of melanin to make them brown''
https://www.iflscience.com/having-r...es-not-mean-youre-descended-from-aliens-69254
