A later generation could have explained the miracle to Sir Frank — though explaining in terms he would not have understood. Though he knew well enough the theory of family traits and likenesses, it would have been impossible then to make him comprehend the intricacy of a chromosome which carries inside it — not merely the stereotypes of parental hair or temperament — but the secret knowledge of how to breathe, how to work the muscles to move the bones, how to grow, how to remember, how to commence the processes of thought … all the infinite number of secret "how to's" that have to be passed on for life to stay above jelly level.
A freak chromosome in Sir Frank ensured he passed on, together with these usual secrets, the secret of his individual consciousness.
Brian Aldiss