Reading Test Practice - Predicting

Scientists have long known that specific genes are associated with a number of serious diseases and birth defects.

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These tests are a significant milestone in genetic research, because they provide people who have genetic defects with important information.

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Unfortunately, for some genetic diseases, there is no treatment, which problem gives rise to even more complex ethical issues.

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Genetic testing is the first step in conquering diseases caused by defective genes.

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_{At the end of the twentieth century, researches began to develop treatments for a variety of life-threatening genetic diseases.}

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Along with these early achievement, however, there were considerable problems and limitations.

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In spite of these setbacks, many scientists pursued their research in gene therapy.

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After years of research and trials, scientists had made considerable progress in solving problems.

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All of these positive results have revived the public’s interest in gene therapy.

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