I read on the web that the size of Y chromosomes decreased in earlier period of time and the picture below tells that it is still occurring.

So basically I want to know what caused this shrinking and if it has stopped now then what caused this break ??

enter image description here

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    $\begingroup$ you can find at least the beginnings of the answer on Wikipedia: en.wikipedia.org/wiki/Y_chromosome#Degeneration $\endgroup$ – Ben Bolker Aug 16 at 17:36
  • $\begingroup$ @Ben Bolker what about the second part ? $\endgroup$ – Ankit Aug 17 at 3:57
  • $\begingroup$ Welcome to SE Biology. As a new user, you should finish reading the tour. Please do not post text as graphics, which discriminate against people with visual deficiencies and which cannot be indexed. Rewrite it as text. $\endgroup$ – David Aug 17 at 8:51

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