Is a black'n'white really white on black or black on white ?

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Is a black'n'white really white on black or black on white ?

Post by dave bu » Wed, 02 Jun 1993 21:21:21



My newspaper had a short piece on this.....seems the colour is controlled by
some chemicals that migrate out from the spinal area during the foetal stage.
Their expert said:
You could say a black cat is the norm (those chemicals get everywhere)
You could say a black'n'white is black (the norm) with white bits (where the
chemicals failed to reach)
You could say a black'n'white is white (foetal state before chemicals
migrate) with black bits (where the chemicals migrate to)
You could say a black is a white with one all-over black patch!

They didn't go into other colours or particular patterns of stripes,
blotches, etc

--
  "I consider myself a pretty good judge of people,
   and that's why I don't like none of them"      ( Roseanne )                                      

 Dave Budd,MCC,Oxford Rd,Manchester,England(44|0)61-275-6033 fax061-275-6040  

 
 
 

Is a black'n'white really white on black or black on white ?

Post by S. Mudgett aka little gat » Thu, 03 Jun 1993 01:17:02



Quote:

>My newspaper had a short piece on this.....seems the colour is controlled by
>some chemicals that migrate out from the spinal area during the foetal stage.
>Their expert said:
>You could say a black cat is the norm (those chemicals get everywhere)
>You could say a black'n'white is black (the norm) with white bits (where the
>chemicals failed to reach)
>You could say a black'n'white is white (foetal state before chemicals
>migrate) with black bits (where the chemicals migrate to)
>You could say a black is a white with one all-over black patch!

quite a few white cats are not pure white but have a small grey or black
patch on the top of the head.  i've heard that most white cats(both the pure
white and the headpatch white) are really genetically grey or black cats with
overlapping white patches covering all of their bodies, or all but the
headpatch.

and most black cats have a few white hairs of a small white spot on their
throat or chest.  my reka mao is otherwise solid black but has always had
a few white hairs in each armpit.  it looks like she uses an underarm
deodorant.  and since she turned 12, she's had a single white whisker on
her face.
--

-- friend of a gator is a friend of mine

 
 
 

Is a black'n'white really white on black or black on white ?

Post by Jean Marie Di » Fri, 04 Jun 1993 10:10:25



   quite a few white cats are not pure white but have a small grey or black
   patch on the top of the head.  i've heard that most white cats(both the pure
   white and the headpatch white) are really genetically grey or black
   cats with overlapping white patches covering all of their bodies, or
   all but the headpatch.

The *** white gene (in genetic shorthand, W) is indeed a masking
gene.  It is epistatic to (covers up) all other color genes that might
affect the cat.  A heterozygous white cat (Ww) bred to a non-white cat
(ww) would produce about half white kittens, and half non-white.

The head patch Susan refers to generally appears only on kittens, and
fades as they grow up.  It shows what color is being masked by the
kitten.  For example, one litter of white Turkish Angoras I knew had
four kittens, out of a white female, by a blue male. Two females had
black spots, one had a blue spot, and the male's spot was cream!  From
this, we deduced that the mother was masking tortoiseshell/calico (ie,
her white gene was "covering up" the tortoiseshell color).  (Figuring
out how we deduced this is left as an exercise for the reader.  For more
clues, read the genetics section of the FAQ. :-)

I'm also told by some breeders of whites that the head spot denotes a
kitten that can hear.  Since deafness is associated with the solid white
color, the head spots are something they like to see. :-)

   and most black cats have a few white hairs of a small white spot on their
   throat or chest.  my reka mao is otherwise solid black but has always had
   a few white hairs in each armpit.  it looks like she uses an underarm
   deodorant.  and since she turned 12, she's had a single white whisker on
   her face.

Many cats (black, blue, black tabby, or whatever) have what's known as a
'locketing' gene.  It can produce anything from tiny chest and/or groin
spots, to great big patches on the chest and groin.  If you have a cat
that has a big white spot on his chest, but no white on his feet, it's
probably the locketing gene at work.  Most (but not all) breeds consider
lockets a color fault, and have attempted to breed them out.  (Two that
do not consider it a color fault are the Cornish Rex and Manx.)  A cat
with the more common white spotting gene would have white feet as well
as white chest/belly.

                                AMBAR