The effects of teratogens

Question

Quizplus · Accepted Answer

The effects of teratogens can vary depending on the age of the organism at the time of exposure. Teratogens may have different effects during different stages of development. For example, exposure to alcohol during the embryonic period can lead to more severe physical and neurological defects than exposure during the fetal period.

Answer: B 
 The most serious effects of teratogens typically occur during the fetal period, which is from week 9 to birth. This is when the organs are fully formed and further development mainly involves growth and differentiation. However, some teratogens can also affect development during the embryonic period (weeks 3-8), which is a critical period for the development of major organs and structures.

A and D are incorrect because the effects of teratogens are not always predictable or straightforward, and may not be detectable at birth. For example, some teratogens may only lead to subtle cognitive or behavioral impairments that are not immediately evident.

The Effects of Teratogens