Repeated cell divisions of the zygote during the earliest embryonic development is known as:___________.

• Fertilization

• Cleavage

• oogenesis

• spermatogensis

Tags

NGSS.HS-LS1-4

Which of the following sequences represents the correct order of events in the formation of a human fetus?

• Zygote → Blastocyst → Embryo → Fertilization

• Fertilization → Zygote → Blastocyst → Embryo

• Blastocyst → Embryo → Differentiation → Zygote

• Fertilization → Growth → Differentiation → Zygote

A process in which cells became specialized in structure and function.

• Genomics
• Enzyme
• Differentiation
• Clone

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-4

The embryo layer that forms the skin and nervous tissue is the _____.

• endoderm

• mesoderm

• ectoderm

• deuterostome

The innermost layer of the blastocyst is the

• endoderm

• gastrula

• ectoderm

• mesoderm

The middle layer of the blastocyst is the

• endoderm

• ectoderm

• mesoderm

• deuterostome

Differentiation is characterized by  

• cellular division and growth. 
• cells becoming specialized in structure and function. 
• body parts being shaped and patterned into a specific form. 
• None of the choices are correct. 

Tags

NGSS.HS-LS1-4

The ectoderm forms the

• Nervous system and skin
• Gastrointestinal system
• Heart and lungs
• Muscles

The mesoderm forms the

• Bones, cartilage and muscles
• Urinary bladder
• Skin
• Glands

From inside to outside, what is the order of the layers of a gastrula?

• mesoderm, ectoderm, endoderm  
• mesoderm, endoderm, ectoderm  
• endoderm, ectoderm, mesoderm  
• endoderm, mesoderm, ectoderm