(April 2014) In law and government, de jure (/deÉª ËdÊÊrÉª/; Latin: de iure, in law) describes practices that are legally recognized by official laws. In contrast, de facto (in fact or in practice) describes situations that are generally known to exist in reality, even if not legally authorized.
Only a portion of them are chromosome abnormalities. Single gene disorders are conditions that are caused by a change in a single gene. Because there are thousands of genes, there are thousands of single gene disorders. This group of disorders cannot be diagnosed by a karyotype.
XYY syndrome is a genetic condition in which males have 47 chromosomes instead of the usual 46 chromosomes. The karyotype is written as 47,XYY as these males have an extra Y chromosome.XYY occurs in approximately one in 1000 live male births and falls into the category of sex chromosome aneuploidy.YY syndrome is a genetic condition in which males have 47 chromosomes instead of the usual 46 chromosomes. The karyotype is written as 47,XYY as these males have an extra Y chromosome.