Which of these chromosomal anomalies was the earliest to be described?
Trisomy 21
Trisomy 18
Trisomy 13
Turner syndrome
Ans. C. Trisomy 13Trisomy 13 was first described by Thomas Bartholin in 1657; trisomy 18 was first described by John Hilton Edwards in 1960; trisomy 21 was first described by John Langdon Down in 1866; and Turner syndrome was first described by Henry Turner in 1938.
Genetics And Genetic Disorders