Which of the following statements correctly describes aneuploid conditions?
A) A monosomy is more frequent than a trisomy.
B) Monosomy X is the only known viable human monosomy.
C) Of all human aneuploidies, only Down syndrome is associated with mental retardation.
D) An aneuploidy resulting in the deletion of a chromosome segment is less serious than a duplication.

Question

Quizplus · Accepted Answer

Monosomy X, also known as Turner syndrome, is the only known viable human monosomy. All other monosomies result in miscarriage or stillbirth.

Answer: A 
 Monosomy is less frequent than trisomy because monosomy results in the loss of a chromosome, while trisomy results in the gain of a chromosome.

Answer: C 
 This statement is incorrect. While Down syndrome is commonly associated with mental retardation, other aneuploidies such as Turner syndrome and Klinefelter syndrome can also result in cognitive and developmental issues.

Answer: D 
 This statement is incorrect. An aneuploidy resulting in the deletion of a chromosome segment can lead to serious health consequences, depending on the genes affected by the deletion. Duplication can also cause health problems, but the severity depends on the specific chromosomal region that is duplicated.

Which of the Following Statements Correctly Describes Aneuploid Conditions