Lesson 25: Multiple Gestations

Question 1

____% of twins are Monozygotic

Answer 1

30%

Question 2

____% of twins are Dizygotic

Answer 2

70%

Question 3

Twins from two ova are always ____

Answer 3

DC/DA

Question 4

The chorion is the ______ sac and the amnion is the _____ sac

Answer 4

Outer
Inner

Question 5

True or False: a single ovum can be DC/MA

Answer 5

False - you cannot have one amnion in two chorion

Question 6

DZ twins always have two:

1)
2)
3)

Answer 6

Amnion
Chorion
Placentas

Question 7

MZ twins can split to DC/DA prior to _____ days, MC/DA between day _____ and ______, or not split and remain MC/MA greater than ____ days. If they do not split at all after _____ days we get conjoined twins

Answer 7

4
4-8
8
13

Question 8

What monozygotic twins are most common?

Answer 8

MC/DA

Question 9

The number of yolk sacs is proportional to the number of ______

Answer 9

Amnion

Question 10

Twins of separate genders are virtually always going to be _______

Answer 10

DC/DA

Question 11

DC/DA is present when we see this sign:

Answer 11

Twin peak sign

Question 12

Labda sign represents:

Answer 12

Dichorionic