Mitzi's child has facial deformities, a smaller than normal head, heart defects, learning difficulties, and delayed growth. If these defects can be traced to a teratogen ingested by Mitzi during pregnancy, it MOST likely would have been

During critical periods

The functioning, but not the structure, of the central nervous system is vulnerable throughout the _____ period.

Babies born before 38 weeks are classified as

Moral and ethical issues in prenatal development and their associated biological and medical practices are studied in

_____ is carried by recessive genes and inherited when a child inherits two recessive genes.

During the embryonic period of prenatal development, the embryo

_____ may cause miscarriage and low birth weight for a developing embryo.

The _____ period occurs between two to eight weeks after fertilization.