Slide showing chart of 'Brachydactylism through five generations'. Slide shows a chart of 'Brachydactylism through five generations'. Brachydactylism in humans is the result of a dominant allele. Sufferers have very short fingers, and their teeth deteriote rapidly. Title for slide is written on the tape at the top of the slide frame, but is also possible to see in reverse on the rear pane of the slide. Late 19th - early 20th century