The General Principle That the Impact of a Teratogen Depends

question 49

Multiple Choice

The general principle that the impact of a teratogen depends upon the genotype of the organism is best illustrated by

• A) rubella being more likely to cause birth defects during some times of pregnancy than during others.
• B) thalidomide during pregnancy causing deformed limbs, but not low birth weight, while the use of marijuana during pregnancy is associated with low birth weight but not deformed limbs.
• C) the effects of eating PCB-contaminated fish while pregnant not being obvious when a child is born, but appearing later in the child's life.
• D) two women who both took thalidomide during pregnancy with one of them giving birth to a child with deformed limbs and the other giving birth to a child with normal limbs.

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Definitions:

Larynx

The organ at the upper end of the trachea that contains the vocal cords.

Nasal Cavity

The large air filled space above and behind the nose in the middle of the face, an important part of the respiratory system.

Higher Altitudes

Regions located at a great height above sea level, often associated with lower atmospheric pressure and decreased oxygen levels.

Partial Pressure

The pressure that a single component of a mixture of gases would exert if it alone occupied the entire volume of the mixture at the same temperature.