What makes a calico cat?

JONATHAN PARRISH jopa at ac.dal.ca
Mon Jun 20 12:51:48 EST 1994

In article <2tiqrk$7kb at jaws.cs.hmc.edu>, purves at jarthur.cs.hmc.edu (Bill Purves) writes:
> In article <bowersox.771542380 at taweret.Colorado.EDU>,
> Paul Bowersox <bowersox at taweret.Colorado.EDU> wrote:
>>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! 
> A male calico cat doesn't come about... the male is hemizygous for this
> locus and will express only the color determined by the allele it
> carries on its single X chromosome.

Actually, male calico cats do occur, although rarely.  I am not sure
what the explanation is, but clearly the simple barr body explanantion
is not as inclusive as it sounds.

Jonathan Parrish
Department of Biochemistry
Dalhousie University
Halifax, N.S.

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