Meaning of tetrasomic | Babel Free

Definitions

1. Having four copies of a particular chromosome
   not-comparable
2. Having four sex chromosomes
   not-comparable

Examples

“Sex chromosome abnormalities occur⟳ in at least 1 in 400 births and include⟳ the well-described 47,XXX, 47,XXY, 47,XYY, and 45,X karyotypes. The addition of more than one extra X or Y chromosome occurs rarely, and little information is available in the medical literature. Individual case reports make⟳ up most of this body of knowledge, and all are based on subjects who identified themselves postnatally. Many were ascertained through screenings of institutions and hospitals; thus, there is no unbiased information on the natural history of poly X and Y karyotypes. A direct⟳ relationship between the number⟳ of additional sex chromosomes and the severity of the phenotype is generally assumed. The purpose of this article is to summarize⟳ what is known about these conditions and to present⟳ 10 additional cases. The karyotypes include⟳, 48,XXXX, 49,XXXXX, 48,XXYY, 48,XXXY, 49,XXXXY, 49,XXXYY, 48,XYYY, 49,XYYYY, and 49,XXYYY.”

CEFR level