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  4. A syndrome is characterized by the furrowed tongue, characteristic palm crease, mental retardation and short-statured with a small round head. It is due to the anomaly of which of the following chromosome?

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Q. A syndrome is characterized by the furrowed tongue, characteristic palm crease, mental retardation and short-statured with a small round head. It is due to the anomaly of which of the following chromosome?

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

Down's syndrome is chromosomal disorder. The cause of this genetic disorder is the presence of an additional copy of the chromosome number 21 (trisomy of 21). This disorder was first described by Langdon Down.