Twins occur in ______ pregnancies in the United States.

• 33.5/1000

• 5/1000

• 100/1000

• 1/1000

Answer explanation

Twins occur in approximately 33.5 out of every 1000 pregnancies in the United States, making this the correct choice. The other options significantly underestimate the occurrence of twin pregnancies.

Which of the following statements about monozygotic twins is TRUE?

• They are always of different sex

• They develop from two separate fertilized ova

• They are genetically identical and often called identical twins

• They tend to repeat in families

Answer explanation

Monozygotic twins, also known as identical twins, develop from a single fertilized egg that splits into two embryos, making them genetically identical. The other statements are incorrect.

Dizygotic twins are also called ______ twins.

• fraternal

• identical

• conjoined

• mirror

Answer explanation

Dizygotic twins are also known as fraternal twins because they develop from two separate eggs fertilized by two different sperm. This distinguishes them from identical twins, who originate from a single fertilized egg.

Define the term: Gravida.

• A woman who is or has been pregnant, regardless of the pregnancy outcome.

• A woman who has never been pregnant.

• A woman who is currently breastfeeding.

• A woman who has had multiple miscarriages.

Answer explanation

The term 'Gravida' refers to any woman who is or has been pregnant, regardless of whether the pregnancy ended in a live birth, miscarriage, or abortion. This definition encompasses all pregnancy experiences.

Define the term: Nulligravida.

• A woman who has never been pregnant.

• A woman who has had multiple pregnancies.

• A woman who is currently pregnant.

• A woman who has had only one pregnancy.

Answer explanation

The term 'Nulligravida' specifically refers to a woman who has never been pregnant. This distinguishes her from those who have had one or more pregnancies.

Define the term: Primigravida.

• A woman who is pregnant for the first time.

• A woman who has had multiple pregnancies.

• A woman who has never been pregnant.

• A woman who is pregnant with twins.

Answer explanation

Primigravida specifically refers to a woman who is pregnant for the first time. This distinguishes her from those who have had multiple pregnancies or none at all.

Define the term: Multigravida.

• A woman who has been pregnant more than once.

• A woman who is pregnant for the first time.

• A woman who has never been pregnant.

• A woman who has delivered twins.

Answer explanation

Multigravida refers to a woman who has been pregnant more than once. This distinguishes her from a primigravida, who is pregnant for the first time, or a nulligravida, who has never been pregnant.

Define the term: Para.

• A woman who has given birth to one or more viable children.

• A woman who has never been pregnant.

• A woman who is currently pregnant.

• A woman who has had multiple miscarriages.

Answer explanation

The term 'Para' refers to a woman who has given birth to one or more viable children, making the first answer choice correct. The other options describe different pregnancy statuses.

Define the term: Primipara.

• A woman who has given birth once.

• A woman who has never been pregnant.

• A woman who has had multiple miscarriages.

• A woman who is currently pregnant.

Answer explanation

Primipara refers specifically to a woman who has given birth once. This distinguishes her from those who have never been pregnant or have had multiple pregnancies, making the first answer choice the correct one.

Define the term: Multipara.

• A woman who has given birth two or more times.

• A woman who has never been pregnant.

• A woman who is currently pregnant for the first time.

• A woman who has had only one miscarriage.

Answer explanation

The term 'Multipara' refers specifically to a woman who has given birth two or more times, distinguishing her from those who have had fewer or no births.