Meiosis and Chromosomal Variations Quiz

What is the primary result of crossing over during meiosis?

• Increased chromosome number

• Genetic variability

• Decreased genetic diversity

• Formation of identical gametes

How many pairs of chromosomes do humans typically have?

• 22 pairs

• 23 pairs

• 24 pairs

• 21 pairs

What is a karyotype?

• A picture of chromosomes arranged by size and shape

• A type of cell division

• A genetic disorder

• A type of gene mutation

What is nondisjunction?

• A process of crossing over

• A failure of chromosomes to separate properly

• A normal part of meiosis

• A type of genetic mutation

In which phase of meiosis does nondisjunction most commonly occur?

• Prophase I

• Metaphase I

• Anaphase

• Telophase

What is trisomy?

• Having four copies of a chromosome

• Having no copies of a chromosome

• Having one copy of a chromosome

• Having three copies of a chromosome

Which syndrome is associated with trisomy 21?

• Turner syndrome

• Klinefelter syndrome

• Down syndrome

• Edward syndrome

What is Turner syndrome characterized by?

• An extra X chromosome

• Only one X chromosome

• Three X chromosomes

• Two Y chromosomes

What is a characteristic of Klinefelter syndrome?

• Presence of an extra Y chromosome

• Presence of an extra X chromosome

• Absence of sex chromosomes

• Presence of three X chromosomes

What is the typical chromosomal composition of a male with Klinefelter syndrome?

• XXY

• XYY

• XY

• XXX