Embryogenesis (Chapter 4)

Question 1

Genetic sex is determined when?

Answer 1

During fertilization (XY or XX)

Question 2

Phenotypic sex is determined when?

Answer 2

Later in the embryo’s life

Question 3

What is differentiation when we talk about cells?

Answer 3

It is the changing of an unidentifiable cell into a identifiable cell

Question 4

What does the inner cell mass go on to become?

Answer 4

The fetus

Question 5

3 components that come from the endoderm

Answer 5

• Digestive system
• Lungs
• Endocrine system

Question 6

4 components that come from the mesoderm

Answer 6

• Reproductive system
• Muscle
• Skeleton
• Cardiovascular system

Question 7

3 components that come from the ectoderm

Answer 7

• Nervous system
• Skin
• Hair

Question 8

What 3 components make up the inner cell mass

Answer 8

• Ectoderm
• Mesoderm
• Endoderm

Question 9

The infundibulum becomes the (posterior/anterior) lobe of the pituitary

Answer 9

Posterior

Question 10

Rathke’s pouch becomes the (posterior/anterior) lobe of the pituitary

Answer 10

Anterior

Question 11

The pituitary gland originates from the ___ and from the ___ of the ___

Answer 11

Brain

Roof of the mouth

Question 12

Yolk sac

Answer 12

Location where the germ cells (testies/ovaries) start

Question 13

Starting from the ___ the germ cells will migrate to the ___

Answer 13

Yolk sac

Urogenital ridge

Question 14

Most major developments happen (early/late) in pregnancy

Answer 14

Early (1st trimester)

Question 15

Which species of animal can have testicular decent after parturition?

Answer 15

Colt

Question 16

The development of male/female gonads happens during which trimester?

Answer 16

Right before the 2nd trimester

Question 17

In the early stages of development the ___ acts as a rudimentary kidney

Answer 17

Mesonephros

Question 18

In the male fetus the remnant mesonephros will go on to become the ___

Answer 18

Efferent ducts

Question 19

In the male fetus the ___ will go on to become the epididymus

Answer 19

Mesonephric duct

Question 20

In the early stages of fetal growth the gonads are considered to be ___

Answer 20

Bipotential (either testies or ovaries)