Causes. Giardia parasites live in the intestines of people and animals. Before the microscopic parasites are passed in stool, they become encased within hard shells called cysts, which allows them to survive outside the intestines for months.Once inside a host, the cysts dissolve and the parasites are released.auses. Giardia parasites live in the intestines of people and animals. Before the microscopic parasites are passed in stool, they become encased within hard shells called cysts, which allows them to survive outside the intestines for months.
On the other hand, those people who eat a lot of processed foods, and/or non-organic foods are susceptible to developing these health issues due to GMOs. For example, about 90% of the corn and soy in the United States is genetically modified. And a lot of processed foods have corn and soy ingredients.
Therefore, genetic diseases can be inherited. Genetic defects cause diseases in a variety of ways. The simplest way is through a loss-of-function mutation. In this type of defect, a change in the DNA nucleotides prevents the gene from making protein, or prevents the protein from functioning once it is made.n the human population, there are several variants (alleles) of most genes, each form of which. is functional and does not cause disease by itself. However, some alleles may predispose a person to a certain disease, especially in combination with other alleles or environmental factors that influence the same trait.