Studies have shown that to become a man, you need to have at least one Y chromosome. 300 million years ago, the male specific Y chromosome contained 1438 genes at the time of its birth, but now there are only 45. At this rate, the Y chromosome will disappear in about 10 million years. 
Y chromosome has a unique palindrome structure, which has the function of self repair, can maintain the information of lost genes and realize gene regeneration
 with the demise of Y chromosome, mankind will also die out.