People with one copy of an abnormal gene for a recessive trait (and who thus do not have the disorder) are called carriers. With codominant traits, both copies of a gene are expressed to some extent. An example of a codominant trait is blood type.
books.google.com-Robert Louis Stevenson originally wrote 'Dr. Jekyll And Mr Hyde' as a 'chilling shocker.' He then burned the draft and, upon his wife's advice, rewrote it as the darkly complex tale it is today.
We recently asked him to pick his seven favorite sci-fi/horror books, most of which still give us the heebie-jeebies in a really good way. For decades writers have mixed science fiction and horror to create haunting stories. Frankenstein. The Strange Case of Dr Jekyll and Mr. Hyde. Invasion of the Body Snatchers.