Disorders caused by chromosomal mutation

Chromosomal mutations are changes in the number or structure of chromosomes, which can lead to various genetic disorders. Here are some common examples:

• Down Syndrome (Trisomy 21): This is caused by an extra copy of chromosome 21. Individuals typically have characteristic facial features, intellectual disability, and may have heart defects or other health issues.
• Turner Syndrome: Affects females and is caused by the absence of all or part of one X chromosome (XO genotype). Characteristics include short stature, infertility, and heart abnormalities.
• Klinefelter Syndrome: Affects males and is caused by an extra X chromosome (XXY genotype). Individuals may have reduced fertility, taller stature, and some feminization of physical traits.
• Edwards Syndrome (Trisomy 18): Caused by an extra copy of chromosome 18. It is a severe condition often associated with significant developmental delays, heart defects, and other organ abnormalities, with a high mortality rate in infancy.
• Patau Syndrome (Trisomy 13): Caused by an extra copy of chromosome 13. This is also a very severe condition leading to serious physical and intellectual disabilities, often with a very short life expectancy.
• Cri-du-chat Syndrome: Caused by a deletion of part of the short arm of chromosome 5. It is characterized by a distinctive high-pitched cry (like a cat's meow) in infancy, intellectual disability, and distinctive facial features.

These disorders arise from errors during cell division (like meiosis) that result in an incorrect number of chromosomes or structural changes within chromosomes.