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The word pedigree is a corruption of the Anglo-Norman French pé de grue or "crane's foot", either because the typical lines and split lines (each split leading to different offspring of the one parent line) resemble the thin leg and foot of a crane [3] or because such a mark was used to denote succession in pedigree charts. [4] A pedigree ...
Pedigree charts published in scientific papers use an earlier anthropological convention of a square for male and a circle for female. [ 7 ] Before a shape distinction was adopted, all individuals had been represented by a circle in Morgan's 1871 System of Consanguinity and Affinity of Human Family , where gender is encoded in the abbreviations ...
An ancestry chart, which is a tree showing the ancestors of an individual and not all members of a family, will more closely resemble a tree in shape, being wider at the top than at the bottom. In some ancestry charts, an individual appears on the left and his or her ancestors appear to the right.
An example pedigree chart of the inheritance of a sex-linked disorder. Each child of a mother affected with an X-linked dominant trait has a 50% chance of inheriting the mutation and thus being affected with the disorder.
An example of pedigree chart. Date: 16 April 2008: Source: ... Add a one-line explanation of what this file represents. ... Genetics; Usage on si.wikipedia.org ...
This phenomenon of the genetics of one individual affecting those of another individual is known as indirect genetic effects. For this population, at least, possible explanations for this atypical heritability pattern exist. While controlling female health and safety, males are responsible for the timing of the start of courtship feeding, as well.
Pedigrees are used to help detect many different genetic diseases. A pedigree can also be used to help determine the chances for a parent to produce an offspring with a specific trait. Four different traits can be identified by pedigree chart analysis: autosomal dominant, autosomal recessive, x-linked, or y-linked.
Genetic genealogy is the use of genealogical DNA tests, i.e., DNA profiling and DNA testing, in combination with traditional genealogical methods, to infer genetic relationships between individuals. This application of genetics came to be used by family historians in the 21st century, as DNA tests became affordable.