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The KE Family: A Genetic Analysis

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a) So, FOXP2 was the gene discovered in the KE family, whose family members over 3 generations had a severe speech disorder. This diffuse condition affects grammar, speech production, non-verbal intelligence and non-speech related movement of the mouth and face. They tested affected and unaffected members of the family and concluded that the disorder has the following characteristics, defects in processing words, understanding of more complex sentences, inability to form intelligible speech, defects in the ability to move the mouth and face and significantly reduced IQ. This gene is also found to cause brain abnormalities. The most significant abnormality was bilateral reduction in the size of caudate nucleus coupled with abnormal high activity

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