Hereditary diabetes mellitus (caused by a recessive mutation) is characterized by an increase in blood sugar due to lack of insulin. A person can transmit this allele to his descendants. What methods of studying human heredity allowed to identify the causes of this disease and the nature of inheritance of the trait?
1) Biochemical – the study of the composition of blood and urine of sick and healthy people
2) Genealogical – determining the nature of inheritance, analyzing the manifestation of the disease in a number of generations.
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