structural abnormalities in chromosomes.
Structural abnormalities in chromosomes refer to alterations or changes in the structure of chromosomes, which can lead to various genetic disorders or abnormalities. Unlike numerical abnormalities (such as aneuploidy), which involve changes in the number of chromosomes, structural abnormalities involve changes in the physical structure of one or more chromosomes.
There are several types of structural abnormalities in chromosomes, including:
1. Deletion: Deletion occurs when a portion of a chromosome is missing or deleted. This can result in the loss of certain genes or genetic material, leading to various genetic disorders. For example, Cri-du-chat syndrome is caused by a deletion on chromosome 5, resulting in developmental and intellectual disabilities.
2. Duplication: Duplication occurs when a section of a chromosome is duplicated or repeated. This can result in the presence of extra copies of certain genes, which can disrupt normal gene function and lead to genetic disorders. For instance, Charcot-Marie-Tooth disease is caused by a duplication of a segment on chromosome 17, affecting peripheral
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