People with Kartagener's syndrome suffer from a variety of ailments, including the intriguing condition known as situs inversus, a reversal of the abdominal and thoracic organs. This condition occurs because of __________.

How is the animal hemisphere of a frog blastula different from the vegetal hemisphere?

What is the most likely trigger of egg activation?

Which of the following is true of meroblastic cleavage?

As an animal develops, organs form and the body transforms into a shape typical of the species in a process called __________.

The digits of a developing vertebrate limb respond to molecules that establish an anterior-posterior axis. These molecules originate in __________.

In an experiment on eye development, a thin piece of aluminum foil was placed between the bulging wall of the brain and the overlying ectoderm where the eye normally forms. Wherever the foil was placed, the lens failed to develop because the foil __________.

Up to the eight-cell stage, the blastomeres of a mouse embryo can each form a complete embryo if isolated. This indicates that __________.

What primitive feature forms during gastrulation?