NY Regents embryology Quiz

What is (A) after the sperm fertilizes the egg?

• Blastula

• Cleavage

• Embryo

• Zygote

What is occurring at B in the diagram?

• Blastula

• Cleavage

• Zygote

• Embryo

After the zygote has gone through the processes of cleavage it becomes an _______ which is begins to be much more complex and cells differentiating into different cells, such as:

skin, muscles, skeletal, brain

• Embryo

• Blastula

• Zygote

• Gastrula

The nervous system and skin originate from the _________ layer.

• Ectoderm

• Mesoderm

• Endoderm

The muscles, circulatory system, skeleton, excretory system, and gonads originate from the ______ layer.

• Ectoderm

• Mesoderm

• Endoderm

The lining of the digestive and respiratory tracts, and portions of the liver and pancreas originate from the _________.

• ectoderm

• mesoderm

• endoderm

What is occurring in this diagram

• cleavage

• ferilization

• specialization

• meiosis

Which reproductive adaptation is characteristic of most terrestrial (land) vertebrates but not most aquatic vertebrates?

• external fertilization

• internal fertilization

• mobile gametes

• external development

Functions as the respiratory membrane and a storage site for nitrogenous wastes, and uric acid

• allantois

• yolk

• amnion

• chorion

In animals, the process of cleavage is best described as the

• fertilization of a mature egg cell by an immature sperm cell

• production of daughter cells having twice the number of chromosomes as the parent cell

• production of daughter cells having half the number of chromosomes as the parent cell

• division of cells resulting in the development of an embryo from a zygote