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Robertsonian Translocation - What is a Robertsonian Translocation?

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Updated June 18, 2014

Chromosomes involved in Robertsonian translocation

Chromosomes involved in Robertsonian translocations

Courtesy of Human Genome Project
Definition: A special type of chromosome abnormality caused by two individual chromosomes joining together to form a new fused chromosome called a translocation. Only certain specific chromosomes can form Robertsonian translocations -- chromosomes 13, 14, 15, 21, and 22. If a number 21 chromosome is involved in forming a translocation, this can cause Down syndrome.
Pronunciation: Robert zone ee an trans-lo-kay-shun
Examples:
A Robertsonian translocation between the number 14 chromosome and the number 21 chromosome, resulted in a new fused chromosome causing the individual to have Down syndrome.

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