Von Willebrand disease (VWD) is a bleeding disorder in which the blood does not clot as it should. Usually, people have VWD due to their genes, which may come from a male or female parent. Blood ...

IN 1865, an Austrian monk called Gregor Mendel, working to understand hybridisation, uncovered exquisitely simple and reliable patterns of inheritance in varieties of garden pea. In 1900, the patterns ...