Originally Posted by caterpillar
Thanks for the genetics lesson!
When is Willow giving birth?
Sorry for all of those questions.
Oh Caterpillar dont be sorry, I love the questions, helps keep me on my toes and keeps me refreshed.
A gray cat is actually a black cat with the dilution gene. The dilution gene is a recessive gene, so any cat that shows (genotype) gray or cream even, has the double recessive gene (indicated as dd) and will pass one of them on to thier children. So they will be carriers. BUT, if the other parent doesnt carry the dilution gene, the baby will be born with full density, ie. black, brown, red, etc.
The white 'spotting' or bi-color (like I said earlier) is a whole other consideration, called the piebald gene (indicated with SS, Ss, or ss). The white spotting is dominant, and generally (it is my understanding anyway - someone correct me if I'm wrong - from what I've read) a cat with with a double domintant gene (SS) will have more white (like a Van or Harlequin) than a heterozygous (Ss) cat.
There are three coat colors: black, chocolate, and cinnamon. All cats carry one of these three colors. If it also has the dilution gene then it becomes: blue (gray) lilac or fawn.
If the cat carries the Red gene (O-) it will override the color, if it is Male is will be red, if it is female, it will be Tortie, or Red if it is homozygous red (OO) since the red gene is sex-liked, which I'm sure you know...
Red mixed with the dilution gene is cream. A cat without the red gene is (oo) a non-red carrier (homozygous non-orange)
And an all-white coat (W-) masks all colors - including red. But still, under that mask, is thier genetic color - or what they would pass onto their off-spring. And how Cassie got her red female. Billy-cat is Red, and the mom is White carrying the orange gene. So from this we know CJ is NOT homozygous white, otherwise ALL her kittens would be born white regardless.
All these things together is what desides if it is cream, tortie, gray, bi-color, calico... whatever. It's basically a combination of a few basic things.
Oh well, I guess I've gone on enough... Sorry if it is too much information, I can get carried away sometimes!
Anymore questions just ask, or even PM me, beleive me, I love this stuff, it's getting someone that cares to listen that's the difficult part
By the way, we're expecting Willow to give birth any day now. I was hoping for it to be over this weekend, mostly so I could sleep in the next day if I had to be up all night
Willow is a homozygous red, no white, long-haired cat. So she is OOwwllD-
remember an orange female is homozygous. No white is a recessive, so we know she is homo-z for this also. She is long-haired, which is also recessive and indicated with the ll. She is not diluted so we know that she has the dominant (D) gene, but we can not tell if she is a dilution carrier. If she were to have a cream kitten then we could know for sure that she does. We dont know what color she carries under the orange. If she has a tortie, we can take a guess. All this said, we dont know who the father was, so the kittens are a bit of a guess. Though we know, unless the father was white, that they will all be red or tortie or a variation of...
See, I told you... I really get carried away, my hubby thinks I'm obsessed! Sorry if you're still reading this mess