Which of the following factors increases the risk for fetal genetic disorders?

A prior child with a known genetic disorder is indeed a significant risk factor for fetal genetic disorders. When a family has already had a child affected by a genetic condition, it may be indicative of a genetic anomaly that could be due to inherited chromosomal abnormalities or specific genetic mutations. This history suggests that the parents may carry genes that could lead to similar issues in future offspring.

Genetic disorders can arise from a variety of inheritance patterns, including autosomal recessive, autosomal dominant, and X-linked traits. The recurrence risk often depends on the specific genetic disorder in question, but having one affected child generally raises concerns about the potential for similar or related issues in subsequent pregnancies. This risk may prompt further genetic counseling and testing for couples who have previously had a child with a known genetic disorder.

Other options, such as maternal age or paternal education level, can influence the risk of certain chromosomal abnormalities, but they don't have as direct an implication as having a prior affected child. Maternal diet during pregnancy generally pertains to overall health and nutrition rather than direct genetic risk. Lastly, while exposure to environmental toxins can have a range of adverse effects, they do not specifically increase the risk of genetic disorders in the way that a known family history does. Thus, having