antepartum

How are identical twins are formed?

• the embryo splits into two and then stays stuck together
• when one egg is fertilized by one sperm and then the embryo divides into two
• when two eggs are fertilized by one sperm 
• when one egg is fertilized by two sperm

The sperm cell carries the 

• X sex chromosome
• Y sex chromosome
• X and Y sex chromosomes
• X or Y sex chromosome

Which of the following body systems are the first to develop in a human?

• circulatory & nervous
• digestive & integumentary
• digestive & skeletal
• skeletal & muscular

Which sequence represents the correct order of events for the formation and development of an embryo?

• meiosis > fertilization > cleavage  > differentiation
• cleavage > meiosis > differentiation >  fertilization
• differentiation > cleavage > meiosis > fertilization
• cleavage >  fertilization > differentiation > meiosis

What is the trophoblast?

• Future uterine lining 
• Future heart
• Future placenta
• Future brain

What part of the blastocyst will develop into the human embryo and eventually into a fetus?  

• archenteron 
• trophoblast 
•  blastopore 
• inner cell mass 

Which of the following serves as the first site of blood formation in the embryo?  

• yolk sac 
• amnion 
• allantois 
• chorion 

The development of the ___________ establishes reference points for the orientation of the developing embryo.

• Primitive streak
• Epiblast
• Zygote
• Mesoderm

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