Answer: (C) genetic predisposition along with an environmental trigger.
Explanation:
We inherit our genes from both parents. Scientists believe <u>several genes are associated with an increased risk of schizophrenia, but that no gene causes the disease by itself. </u>In fact, recent research has found that people with schizophrenia tend to have higher rates of rare genetic mutations and it probably disrupts brain development.
Scientists think <u>interactions between genes and the environment may be a reasoning for schizophrenia to develop.</u> <u>Many environmental factors may be involved, such as exposure to viruses or malnutrition before birth, problems during birth, and other not yet known factors.</u>
Recessive alleles are denoted by a lowercase letter (a versus A). Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait.
