What type of genetic disorder typically results from both genetic predisposition and environmental factors?

What type of genetic disorder typically results from both genetic predisposition and environmental factors?

• A. Single-gene disorders
• B. Multifactorial inheritance
• C. Chromosomal disorders
• D. Infectious disorders

Answer: (B)

Multifactorial inheritance is the correct response because it refers to genetic disorders that arise from the interaction of multiple genes and environmental factors. This category encompasses a range of conditions, such as heart disease, diabetes, and many forms of cancer, which are influenced not only by genetic makeup but also by lifestyle, environmental exposures, and other external factors.

In contrast, single-gene disorders are caused by mutations in a specific gene and do not result from environmental influences. Chromosomal disorders involve abnormalities in chromosome structure or number, with distinct genetic origins that do not typically involve environmental contributions. Infectious disorders are caused by pathogens and are not directly related to genetic predisposition. Recognizing the interplay between genetics and environment in multifactorial inheritance is crucial for understanding many common health conditions and for developing effective prevention and treatment strategies.