Punnit Square woes

[CntrlF8]

Ok, I know the basics for building them... dom/codom, easy.. simple recessive, easy.. double recessive, harder, but I get it...

Now, could someone show me a punnit square for a codom/simple recessive crossing? I know that if you cross a codom with a homo simple recessive you get normals and codoms, both het for the recessive gene. What if you cross a codom het for the recessive, with another (same) codom het for the same recessive?

EDIT: I don't want to know the actual results. I just want to know how to put it in a punnit square...

[Kagez28]

i got a C in my genetics class last year but i'll attempt....

i am gonna use honey bees for an example
AA would be the allele that makes spider (could be hetero or homo)
Bb would be the allele that makes hypos- Bb being a het
coDom het recessive x same= AA,Bb x AA,Bb

so set up your square like this...
__ AB Ab AB Ab
AB
Ab
AB
Ab


if you do all the crosses it ends up like this.

AABB: 25% spiders
AABb: 50% spiders het for hypo
AAbb: 25% honey bees

some one correct me if i am incorrect, as i am learning all this again..

[CntrlF8]

Ok, I got it... I went back and re-read NERD's double-het genetics page and was able to figure it out. It's the same as double-het's basically, since a co-dom is really just a het for a super morph...

[MATTI]

ok let's take cinnamon as a codom and albino as a reces. het.
aa = albino
Cc = cinn

You cross cinn het. alb x cinn het. alb:

CcAa x CcAa

-----CA-----cA----Ca-----ca

CA CCAA CcAA CCAa CcAa

cA CcAA ccAA cCAa ccAa

Ca CCAa CcAa CCaa Ccaa

ca CcAa ccAa Caca ccaa

[CntrlF8]

ok let's take cinnamon as a codom and albino as a reces. het.
aa = albino
Cc = cinn

You cross cinn het. alb x cinn het. alb:

CcAa x CcAa

-----CA-----cA----Ca-----ca

CA CCAA CcAA CCAa CcAa

cA CcAA ccAA cCAa ccAa

Ca CCAa CcAa CCaa Ccaa

ca CcAa ccAa Caca ccaa

Yeah, that's actually the example I was using on my own, and the result I came up with. Thanks!

[Kagez28]

Yeah, that's actually the example I was using on my own, and the result I came up with. Thanks!

this helps too....

http://www.changbioscience.com/genetics/punnett.html

[CntrlF8]

Nice!!!

[Blue Apple Herps]

this helps too....

http://www.changbioscience.com/genetics/punnett.html

Beat me to it!