What is nondisjunction?

• A chromosomal mutation involving the loss of a segment of a chromosome

• A condition in which an individual has an extra copy of a specific chromosome

• A genetic disorder characterized by intellectual disability and distinct facial features

• A genetic event during cell division when chromosomes fail to separate properly

Answer explanation

Nondisjunction is a genetic event during cell division when chromosomes fail to separate properly.

What is trisomy?

• A chromosomal mutation involving the loss of a segment of a chromosome

• A condition in which an individual has an extra copy of a specific chromosome

• A genetic disorder characterized by intellectual disability and distinct facial features

• A genetic event during cell division when chromosomes fail to separate properly

Answer explanation

Trisomy is a condition where an individual has an extra copy of a specific chromosome. It is a chromosomal mutation involving the presence of an additional chromosome.

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What is monosomy?

• A condition in which an individual has an extra copy of a specific chromosome

• A genetic disorder characterized by intellectual disability and distinct facial features

• A genetic event during cell division when chromosomes fail to separate properly

• A condition in which an individual is missing one copy of a specific chromosome

Answer explanation

Monosomy is a condition where an individual is missing one copy of a specific chromosome.

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What is a Barr body?

• A genetic event during cell division when chromosomes fail to separate properly

• An inactivated X chromosome in the cells of females

• A condition in which an individual has an extra copy of a specific chromosome

• A chromosomal mutation involving the loss of a segment of a chromosome

Answer explanation

A Barr body is an inactivated X chromosome in the cells of females.

What is Down syndrome?

• A genetic event during cell division when chromosomes fail to separate properly

• A genetic disorder characterized by intellectual disability and distinct facial features

• A condition in which an individual has an extra copy of a specific chromosome

• A chromosomal mutation involving the loss of a segment of a chromosome

Answer explanation

Down syndrome is a condition where an individual has an extra copy of a specific chromosome. It is characterized by intellectual disability and distinct facial features.

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What causes Down syndrome?

• The presence of an extra copy of chromosome 21

• A genetic disorder characterized by intellectual disability and distinct facial features

• A chromosomal mutation involving the loss of a segment of a chromosome

• A genetic event during cell division when chromosomes fail to separate properly

Answer explanation

Down syndrome is caused by the presence of an extra copy of chromosome 21, leading to a genetic disorder characterized by intellectual disability and distinct facial features.

How can Down syndrome be detected before birth?

• Through non-invasive tests like maternal serum screening and ultrasound

• Through genetic testing after birth

• Through physical examination of the newborn

• Through a chromosomal mutation involving the loss of a segment of a chromosome

Answer explanation

Down syndrome can be detected before birth through non-invasive tests like maternal serum screening and ultrasound.

What is Turner syndrome?

• A chromosomal mutation involving the loss of a segment of a chromosome

• A genetic disorder in which an individual is born with a single X chromosome

• A genetic disorder characterized by intellectual disability and distinct facial features

• A condition in which an individual has an extra copy of a specific chromosome

Answer explanation

Turner syndrome is a genetic disorder where an individual is born with a single X chromosome, making it the correct choice.

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What is Klinefelter syndrome?

• A genetic disorder characterized by intellectual disability and distinct facial features

• A genetic disorder in which an individual is born with a single X chromosome

• A chromosomal mutation involving the loss of a segment of a chromosome

• A genetic disorder characterized by the presence of an extra X chromosome in males

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What is a deletion?

• A chromosomal mutation in which a segment of a chromosome is copied or repeated within the same chromosome

• A chromosomal mutation involving the loss of a segment of a chromosome

• A genetic disorder characterized by intellectual disability and distinct facial features

• A genetic event during cell division when chromosomes fail to separate properly

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