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Registered User
Punnit Square woes
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...
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BPnet Veteran
Re: Punnit Square woes
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..
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Registered User
Re: Punnit Square woes
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...
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BPnet Veteran
Re: Punnit Square woes
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
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Registered User
Re: Punnit Square woes
Originally Posted by 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
Yeah, that's actually the example I was using on my own, and the result I came up with. Thanks!
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BPnet Veteran
Re: Punnit Square woes
Originally Posted by CntrlF8
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
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Registered User
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Re: Punnit Square woes
Originally Posted by Kagez28
Beat me to it!
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