Source: American Council on Science and Health

In poor parts of the world, people may rely on a single staple crop to meet a substantial proportion of their energy requirements. Many denizens of Africa rely on cassava. The trouble with cassava, however, is that it is nutrient-poor. Partially as a result, iron and zinc deficiencies are common in Africa. Iron deficiency results in anemia, zinc deficiency in susceptibility to death by diarrhea, and each is also associated with impaired cognitive development. Breeding better varieties of cassava that absorb and store more of these nutrients is made difficult by a lack of genetic diversity. So, scientists have turned to biotechnology.