Which factors influence the effect of teratogens?

Which factors influence the effect of teratogens?

• A. Only Blood type
• B. Geographic location
• C. Time of day of exposure
• D. Dose, Heredity, and Age or development stage

Answer: (D)

Teratogenic risk is shaped by three key factors: dose, heredity, and the timing of exposure in development. A larger dose generally increases the chance and severity of birth defects because more of the toxin reaches developing tissues. Genetic differences can influence how a toxin is processed and how sensitive certain tissues are, so individuals can respond differently to the same exposure. The stage of development matters because different organs form at specific times, so exposure during a critical window can disrupt those processes, while the same exposure at another time may have little or no effect. While geographic location can affect the kinds of exposures people encounter, the most consistent determinants of teratogenic effects are how much exposure occurs, the individual's genetic susceptibility, and when during development the exposure happens.

Teratogenic risk is shaped by three key factors: dose, heredity, and the timing of exposure in development. A larger dose generally increases the chance and severity of birth defects because more of the toxin reaches developing tissues. Genetic differences can influence how a toxin is processed and how sensitive certain tissues are, so individuals can respond differently to the same exposure. The stage of development matters because different organs form at specific times, so exposure during a critical window can disrupt those processes, while the same exposure at another time may have little or no effect. While geographic location can affect the kinds of exposures people encounter, the most consistent determinants of teratogenic effects are how much exposure occurs, the individual's genetic susceptibility, and when during development the exposure happens.