Chromosomal deletion
Chromosomal Deletion
Chromosomal deletion or deficiency is a mutation that occurs when a part of a chromosome is missing or deleted.
Pronunciation
- Chromosomal: /ˌkroʊˈmoʊ.sə.məl/
- Deletion: /dɪˈliː.ʃən/
Etymology
The term "chromosomal deletion" is derived from two words. "Chromosomal" comes from the Greek word "chroma" meaning color and "soma" meaning body, referring to the colored bodies seen in the cell nucleus. "Deletion" comes from the Latin word "deletio" meaning to destroy or remove.
Definition
Chromosomal deletion is a type of chromosomal abnormality in which a chromosome's section is absent. This can occur in any location on the chromosome and can range in size from one gene to an entire chromosome arm.
Causes
Chromosomal deletions are usually caused by errors during meiosis, the process that produces eggs and sperm. These errors can occur during the formation of the egg or sperm, or shortly after fertilization.
Symptoms
The symptoms of chromosomal deletion syndromes vary widely and depend on which genes are missing. Common symptoms can include intellectual disability, delayed development, physical abnormalities, and health problems.
Related Terms
External links
- Medical encyclopedia article on Chromosomal deletion
- Wikipedia's article - Chromosomal deletion
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