Biology 30 - Fertilization & Pregnancy

Question 1

Cleavage

Answer 1

• Rapid mitotic divisions

Question 2

What is the cell referred to when it is at 16 cells?

Answer 2

• Morula

Question 3

What is the morula referred to 6 days after fertilization?

Answer 3

• Blastocyst

Question 4

What is the outer layer of the blastocyst called?

Answer 4

• Chorion

Question 5

What will the inner cell mass of the blastocyst become?

Answer 5

• The embryo

Question 6

What are the four extra embryonic membranes?

Answer 6

1. Chorion
2. Allantois
3. Amnion
4. Yolk sac

Question 7

Chorion

Answer 7

• Forms the fetal portion of the placenta
• Secretes HCG

Question 8

Allantois

Answer 8

• Provides blood vessels in the placenta
• Foundation of the umbilical cord

Question 9

Amnion

Answer 9

• Forms the amniotic sac
• Protects the developing embryo/fetus

Question 10

Yolk sac

Answer 10

• Site of early red blood cell formation and lining of the digestive tract

Question 11

Morphogenesis

Answer 11

• Series of events that form the distinct structures of the developing fetus.

Question 12

Gastrulation

Answer 12

• Formation of three primary germ layers

Question 13

What are the three germ layers in gastrulation?

Answer 13

1. Ectoderm
2. Mesoderm
3. Endoderm

Question 14

Chorionic villi

Answer 14

• Finger-like projections that will extend as part of the umbilical cord into the endometrial lining of the uterus.

Question 15

Teratogens

Answer 15

• Any agents that will cause a structural abnormality due to exposure during pregnancy.

Question 16

Colostrum

Answer 16

• Released before lactation milk
• Does not have fats and sugars so baby will not gain weight
• Strengthens baby’s immune system

Question 17

Gestation

Answer 17

• Process of pregnancy, where a fertilized egg grows into a baby inside the mother’s womb.
• Usually lasts around 40 weeks in humans, starting from conception and ending with birth.
• During this time, the baby develops and matures.