A young girl was born with a patch of soft fur that ran from the base of her neck to her tailbone. she did not display any other symptoms of disease, and results of her karyotype seemed normal. no one on either her mother or father's side of the family had ever been born with this oddity. her concerned mother's side asked a doctor if her daughter would have children that were similarly furry. the doctor told her that while he couldn't be 100% certain, he suspected that this characteristic was the result of