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More than a century ago, Wilhelm Johannsen proposed the terms “genotype” and “phenotype” to study heredity. Much of what we know about genetics and behavior has evolved since then, especially how causality from genotypes can be inferred from observational studies of phenotypes. Unfortunately, there are genotypes that produce complex clinical‐behavioral phenotypes—pleiotropy. In addition, there are...
CHARGE syndrome (CS) is a genetic disorder whose first description included Coloboma, Heart disease, Atresia of choanae, Retarded growth and development, Genital hypoplasia, and Ear anomalies and deafness, most often caused by a genetic mutation in the CHD7 gene. Two features were then added: semicircular canal anomalies and arhinencephaly/olfactory bulb agenesis, with classification of typical,...
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