Question

Describe the structure of sex-chromosomes. 

Answer 1

Structure of X and Y chromosomes 

1. X chromosomes are longer than Y chromosomes. 
2. X chromosome contains large amount of euchromatin and small amount of 
   heterochromatin, whereas the Y chromosome contains small amount of euchromatin
   and large amount of heterochromatin.
3. Non-homologous region of X-chromosome contains more genes than that of nonhomologous region of Y chromosome. 
4. Non-homologous region of X-chromosome contains X-linked genes while nonhomologous region of Y chromosome contains Y-linked genes.