SORU: boş bırakılan yere parçanın anlam bütünlüğünü sağlamak için getirilebilecek cümleyi bulunuz
Down's syndrome, muscular dystrophy, and haemophilia may be among the best-known genetic diseases, but they are most certainly not alone. Several thousand human genes are linked, when they fail to work properly, to more than 4,000 heritable genetic diseases. Moreover, only a handful of these diseases are treatable. -- --
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Deactivating such genes during embryonic development does not kill the embryo, which suggests that disease-related genes are recently evolved. |
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Researchers have found that the majority of disease-causing genes were originally present in single-celled organisms and that most of the rest arose much later. |
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Haemophilia, for example, achieved widespread visibility among the European public when it afflicted several generations of royal families on the Continent. |
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The incidence of juvenile diabetes, another heritable disorder, is on the rise in the US, much to the alarm of public-health authorities. |
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Any way of systematizing knowledge about them would thus be welcome, starting with features that the genes that cause diseases have in common. |