Thalidomide, Now Banned for Use as a Sedative in Pregnancy

Multiple Choice

Thalidomide, now banned for use as a sedative in pregnancy, was used in the early 1960s by many women in their first trimester of pregnancy. Some of these women gave birth to children with arm and leg deformities, suggesting that the drug most likely influenced

A) early cleavage divisions.
B) determination of the polarity of the zygote.
C) differentiation of bone tissue.
D) morphogenesis.
E) organogenesis.