There was a failure of the twenty-first pair of chromosomes to separate during meiosis,so Aziz received three of these chromosomes rather than the normal two.Aziz has __________ syndrome.
A) XYY
B) Klinefelter
C) Turner
D) Down

Question

Quizplus · Accepted Answer

The failure of the twenty-first pair of chromosomes to separate during meiosis results in Down syndrome or trisomy 21, where the affected individual has three copies of chromosome 21. XYY syndrome (A) is a condition where the male has an extra Y chromosome. Klinefelter syndrome (B) occurs when males have an extra X chromosome, resulting in XXY instead of XY. Turner syndrome (C) is a condition where females have only one X chromosome instead of two.

There Was a Failure of the Twenty-First Pair of Chromosomes