Asked whether he had noticed the ardent fanbase he has attracted during the latest season of the BBC show, he said: Normally, X chromosome inactivation occurs at random: Already registered? Vote Are you sure you want to submit this vote? Find your bookmarks in your Independent Minds section, under my profile. The X chromosome is one of two sex chromosomes in mammals; the other is the Y chromosome. Log in using your social network account.
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Submit vote Cancel. Report Comment Are you sure you want to mark this comment as inappropriate? Subscribe to Independent Minds to debate the big issues Want to discuss real-world problems, be involved in the most engaging discussions and hear from the journalists? The researchers examined a phenomenon called "X chromosome inactivation" in 97 mothers of gay sons and mothers whose sons were not gay.