460 READINGS IN EVOLUTION, GENETICS, AND EUGENICS 
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Such human abnormalities are inherited. ‘There 
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two joints instead of three and a thumb with one joint in place of two 
(brachydactylism). 
Males in the chart are represented by 4, females by 2, 
is given on this page a chart (Fig. 96) of a family tree in which 
brachydactylism is very common; it is based on a study made by 
Drinkwater. 
