Recessive

[Lesserlove]

So this caramel I have recently aquired has got me into some reading about oh double recessive genetics would work. So I was reading a little bit off this site as a starter reference and there is one portion I can't wrap my brain around. Why is the Caramel's genetics in the punnet a cG? What does this mean? Isn't Caramel a base morph? Why does this base-recessive morph seem to (In this punnet square) have a backwards heterozgous genotype? Confused! How would a recessive morph have any type of dominant trait in the geno??

[satomi325]

. Why is the Caramel's genetics in the punnet a cG? What does this mean? Isn't Caramel a base morph? Why does this base-recessive morph seem to (In this punnet square) have a backwards heterozgous genotype? Confused! How would a recessive morph have any type of dominant trait in the geno??

I think that site just wrote the genotype abbreviations poorly.


Caramel genotype = ccGG according to that site.

cG are the genes the Caramel parent is donating to the offspring. The offspring is getting half of what each parent has. It takes 2 caramel genes(cG) to make a homozygous (visual) recessive animal.

cG = normal 100% het caramel
ccGG = visual caramel.



So.
2 parents. Let's just use the caramel parent.
It can either donate a cG or a cG to the offspring. If the offspring only has cG, then it does not look caramel, but carries the 1 caramel gene. If the offspring has 2 cG (aka ccGG), then it looks caramel and has 2 copies of the gene.

[OhhWatALoser]

There is no standard way to do a punnet square. Personally I use a method that I didn't learn in any book, just go with whats easiest for me.

But im assuming your looking at NERD's site, they represent the morph genes as lower case letters and also note the classification for some reason in the punnet square for their dom/co-dom stuff.

But the reason the G is in there is because they are talking about double recessives. The C stand for the caramel's locus and the G stands for the hypo/ghost locus. The capital G means a normal gene in the hypo/ghost locus. so ccGG is two morph caramel genes in the caramel locus and two normal genes in the hypo/ghost locus.

[Lesserlove]

Bare with me here I want to make sure I understand this 100%. So if a visual caramel is supposed to be ccGG, with Gs being the normal gene (right?) why is the caramel still visual if the normal is in the geno as a dominant trait? ccGG, why not just cc?

[Lesserlove]

I'm a dumby I swore I posted the site I was talking about. lol

http://www.newenglandreptile.com/gen...recessive.html

[Pythonfriend]

if you look at a visible caramel, it is simply cc, you are right. and a het caramel is cC.

ccGG just means that its a visible caramel, and in addition, its not a ghost. the Gs are only there because of context: they are looking at 2 genes.

so, with the context...

ccGG is the caramel
CCgg is a ghost
cCgG is a double-het caramel ghost
CCGG is a normal BP
ccgG is a caramel het ghost
cCgg is a ghost het caramel

And the goal of all that is to breed the ccgg, caramel ghost double recessive.

(i guess you already realized that the letters are small because its a recessive morph, so the regular genes dominate over the mutation, and get the capital letters).