Multiple Choice
When a chromosome undergoes a deletion mutation, what happens to the genetic information in the deleted segment?
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6. Chromosomal Variation
Chromosomal Rearrangements: Deletions
Multiple Choice
Which of the following genetic diseases is an example of a chromosomal deletion?
A
Down syndrome
B
Familial down syndrome
C
Cri du Chat syndrome
D
Klinefelter's Disease
Verified step by step guidance1
Understand the concept of chromosomal deletion: A chromosomal deletion occurs when a part of a chromosome is missing or deleted, leading to a loss of genetic material.
Review the characteristics of Cri du Chat syndrome: This genetic disorder is caused by a deletion of a portion of chromosome 5, specifically the short arm (5p).
Compare Cri du Chat syndrome with other listed conditions: Down syndrome is caused by an extra chromosome 21 (trisomy 21), not a deletion. Familial Down syndrome involves a translocation, and Klinefelter's Disease is due to an extra X chromosome (XXY).
Identify the key difference: Cri du Chat syndrome is the only condition among the options that involves a chromosomal deletion.
Conclude that understanding the type of chromosomal abnormality is crucial in identifying genetic diseases associated with deletions.
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