Genetic Drift and the Founder Effect. Polydactyly -- extra fingers or sometimes toes -- is one symptom of Ellis-van Creveld syndrome. Genetically inherited diseases like Ellis-van Creveld are more concentrated among the Amish because they marry within their own community, which prevents new genetic variation from entering the population.
The Sogeti Group is an information technology consulting company specializing in local professional services. At the 2014 Microsoft Partner of the Year Awards, Sogeti was a finalist in the Devices and Deployment Partner of the Year category.
The gyri are part of a system of folds and ridges that create a larger surface area for the human brain and other mammalian brains. Because the brain is confined to the skull, brain size is limited.achygyria (meaning thick or fat gyri) is a congenital malformation of the cerebral hemisphere, resulting in unusually thick gyri in the cerebral cortex. Pachygyria is used to describe brain characteristics in association with several neuronal migration disorders; most commonly relating to lissencephaly.