What makes a calico cat?

Patricia Grandoni pgrandon at soma.UMDNJ.EDU
Wed Jun 15 15:17:17 EST 1994

bowersox at taweret.Colorado.EDU (Paul Bowersox) writes:

>Okay, so this is an easy one... except I can't remember exactly!

>If I recall correctly, it has to do with a female X chromosome getting
>turned off, except the same one is not turned off in all the cells,
>resulting in a mosaic... but I don't know exactly.

>Oh well.  If anyone knows offhand, let me know either here or by e-mail. 
>Thanks much!  

>PS -- You might even comment on how a male calico cat might come about, if
>you want to enlighten me on that score as well! 

>Paul Bowersox
>bowersox at colorado.edu
 I believe that male calicos are not allowed.  The gene is carried on the x
chromosomee but it is recessive so you need both chromosomes to get
expression of the trait.

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