Embryonic Development

A female egg that has been fertilized.

• Amniotic Sac
• Placenta
• Infant
• Zygote

Tags

NGSS.HS-LS3-1

Ovum/Egg and sperm unite to form a(an) ______.

• zygote
• fetus
• egg
• embryo

Which system develops first in the embryo?  

• reproductive 
• circulatory 
• nervous 
• respiratory 

Identical twins develop from

• one egg, fertilized by one sperm
• one egg, fertilized by two separate sperm cells
• two eggs, both fertilized by the same sperm cell
• two eggs, each fertilized by a separated sperm cell

The joining of a sperm cell and an egg cell is called...

• Fertilization
• Labor
• Zygote
• STOP ASKING ME THESE IMPOSSIBLE QUETSIONS!!

____________ is how long a human pregnancy lasts.

• 40 weeks
• 30 weeks
• 3 months

Supplies nutrients to the fetus

• Amniocentesis
• Ovum
• Placenta

Fertilization of an egg cell can happen without the presence of a sperm cell.

• True
• False

Which of the following is a disadvantage of external fertilization?

• The zygote is potentially exposed to environmental hazards
• Large numbers of eggs can be fertilized at one time.

Which of the following is an advantage of internal fertilization?

• Gametes may get washed away.
•  The developing zygote is protected.