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Topic: Re:Re:Re:We want kittens!
Posted by: Louise Cole
Date/Time: 11/02/15 16:23:00

Its to do with colours on chromosomes - to be a tortoiseshell, a cat needs to have an x chromosome with black on it and a separate chromosome with ginger on it.  Therefore, if an animal has two Xs it can be tortoiseshell and females are XX.  However, males being XY means they can be either black OR ginger but to have both they must be XXY, i.e. have an extra strand of DNA.  This can happen in very rare instances, as it can in humans, but that cheeky little extra X chromosome can cause all sorts of health issues, making survival very unlikely.

Entire Thread
TopicDate PostedPosted By
We want kittens!11/02/15 14:07:00 Alice Webster
   Re:We want kittens!11/02/15 14:23:00 Andy Pease
   Re:We want kittens!11/02/15 16:00:00 Louise Cole
      Re:Re:We want kittens!11/02/15 16:10:00 Bob Guyett
         Re:Re:Re:We want kittens!11/02/15 16:23:00 Louise Cole
            Re:Re:Re:Re:We want kittens!11/02/15 16:27:00 Louise Cole
               Re:Re:Re:Re:Re:We want kittens!11/02/15 18:46:00 Bob Guyett
   Re:We want kittens!11/02/15 17:25:00 Charlotte Kasner
      Re:Re:We want kittens!11/02/15 17:45:00 Claire Moran
         Re:Re:Re:We want kittens!11/02/15 17:46:00 Claire Moran
      Re:Re:We want kittens!13/02/15 20:15:00 Vanessa Smith
   Re:We want kittens!12/02/15 22:41:00 Alice Webster
   Re:We want kittens!13/02/15 12:35:00 Caroline Webster

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