Author Question: A pregnant patient asks you to describe the differences between monozygotic and dizygotic twins. ... (Read 20 times)

lidoalex · **on:** Jun 28, 2018

A pregnant patient asks you to describe the differences between monozygotic and dizygotic twins. Which statement should you include in your teaching?

1. Dizygotic twinning occurs less frequently than does monozygotic twinning.
2. Monozygotic twins originate from division of the fertilized ovum at different stages.
3. Dizygotic twins share one placenta and one chorion.
4. Monozygotic twins are also referred to as fraternal twins.

Question 2

Which statement by a pregnant patient would indicate that additional teaching was necessary?

1. Because of their birth relationship, fraternal twins are more similar to each other than if they had been born singly.
2. Identical twins can be the same or different sex.
3. Congenital abnormalities are more prevalent in identical twins.
4. Identical twins occur more frequently than fraternal twins.

parker125 · **Reply #1 on:** Jun 28, 2018

Answer to Question 1

Correct Answer: 2
Rationale 1: Dizygotic twinning occurs more frequently than does monozygotic twinning.
Rationale 2: Monozygotic twins originate from division of the fertilized ovum at different stages of early development.
Rationale 3: Dizygotic twins each have a separate chorion and amnion.
Rationale 4: Monozygotic twins are also referred to as identical twins.

Answer to Question 2

Correct Answer: 3
Rationale 1: Fraternal twins are not more similar to each other than if they had been born singly.
Rationale 2: Identical or monozygotic twins have identical chromosomal structures and therefore are always the same sex.
Rationale 3: Due to variations in the timing of the splitting of the embryo, congenital abnormalities such as conjoining are more common in monozygotic twins.
Rationale 4: Dizygotic, or fraternal, twins occur more frequently than do monozygotic twins.