A teratogen is a harmful agent that can cause abnormal development or birth defects. Option A is incorrect as genetic mutations are not classified as teratogens unless they are caused by external factors such as radiation. Option C is incorrect as it describes a chromosomal abnormality, not a teratogen. Option D is incorrect as hemophilia and red-green color blindness are caused by an X-linked recessive gene, not a Y-linked recessive gene.

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A Teratogen Is A

Question 66

Multiple Choice

A teratogen is a:

A) specific type of genetic mutation that typically results in severe birth defects.
B) harmful agent, such as a chemical, drug, or disease, which can cause abnormal development or birth defects.
C) segment of DNA that is sometimes found on both the X and Y chromosome and that commonly results in mental retardation.
D) recessive gene which is usually found only on the Y chromosome and that causes hemophilia and red-green color blindness in males.

Correct Answer: