Twin Gestation

Question 1

The natural incidence of multiple gestation is about ………… and this is following what rule………

Answer 1

1:89^n-1

Hellin’s rule

Question 2

Twin pregnancy can be classified into what based on number of oocytes fertilized

Answer 2

Monozygotic
Dizygotic

Question 3

What is the result of one single sperm fertilizing an oocyte with its resultant zygote undergoing mitotic division

Answer 3

Monozygotic twins
(Usually identical twins of the same sex)

Question 4

What is the result of a woman producing two oocytes that get fertilized by two different spermatocytes

Answer 4

Dizygotic twins
Fraternal twins, may or may not be of same sex

Question 5

Classsification based on the number of placenta and amniotic sacs

Answer 5

Monochorionic monoamniotic twins
Monochorionic diamniotic twins
Dichorionic diamniotic twins

Question 6

Division after 72 hours of fertilization gives

Answer 6

Dichoroinic diamniotic twins

Question 7

Division between 4 to 8 days after fertilization gives

Answer 7

Monochorionic Diamniotic twins

Question 8

Division after 8 days of fertilization

Answer 8

Monochorionic Monoamniotic twins

Question 9

Division after two weeks of fertilization

Answer 9

Conjoined twins