Dear Aspirant, since Y-chromosome possesses small amount of euchromatin that contains DNA or genes, therefore it is genetically less active. Recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to "put the brakes on", slowing the rate of gene loss to a possible standstill. I hope you are clear now. If you have any other doubts feel free to ask. All The Best!!!

Hello,

Y chromosome is less active means that genes on the Y chromosome cannot undergo genetic recombination, the shuffling of genes that occurs in each generation which helps to eliminate damaging gene mutations. Deprived of the benefits of recombination, Y chromosomal genes degenerate over time and are eventually lost from the genome.

This implies that qualities on the Y chromosome can't go through hereditary recombination, the "rearranging" of qualities that happens in every age which assists with wiping out harming quality transformations. Denied of the advantages of recombination, Y chromosomal qualities degenerate over the long run and are in the end lost from the genome.