i have to assume this is your read on things since you won't offer up any other documentation backing it up.
the first and i think most critically flawed is the assumption that differentiation == bias.
differentiation happens with everything that is different than you across species. differentiation even happens in group meaning you differentiate the individual in front of you from yourself.
now you want to say that this implies that you will treat the person who looks different than you different than the person that looks like you. but different doesn't mean with bias, particularly not with the bias we associate with racism. instead it's likely the difference is more cautionary, waiting instead for the experiences to dictate how this person who is different than you should be treated.
to show a genetic link to racial bias would mean that there is actually a gene which gets passed down from parent to child which not just informs the difference but the response to that difference.
take animal cubs. if an animal is separated from its parent before it learns to hunt it's highly likely that it will not survive because it has not been taught which things are food. based on what you're saying that should automatically be encoded into the differentiation via genes.
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