In-depth research on it has been made possible in 
In-depth research on it has been made possible in recent years by the invention of denaturing high performance liquid chromatography, which has identified over two hundred polymorphisms. The two pseudoautosomal regions bracket a space comprising ninety-five percent of its length known as the non- recombining region, which has a unique preponderance of palindromic genes. Its sequences are classified as "degenerate," "transposed" and "ampliconic." About one in two thousand people have an extra one, which causes difficulty in retaining fat and poor coordination. For ten points, name this chromosome which determines maleness.
In-depth research on it has been made possible in recent years by the invention of denaturing high performance liquid chromatography, which has identified over two hundred polymorphisms.
Y chromosome