Re: Double Recessive Traits? How does that work?
the a+'s on the site are the hiden albino gene.
When breeding an albino to an albino you dont get another morph....
Re: Double Recessive Traits? How does that work?
Quote:
Originally Posted by BaLLPAddICT
okay well if this is true then im getting somewhere. These punnet squares for the simple recessive and dom/co-dom types of balls had the tables set up like for an albino a|a for one parent and the other parent a|a. Was that just simplifying it like it really is aa|aa and aa|aa for albino? And the other genes are two also exept not the same like albinos? And those make a different morph? ahh.. i think i understand this now..
on one of the genetics pages on ballpython.com it had this for the genetics of an albino and an axanthic: aaax+ax+ x a+a+axax so if i were to separate them it would be like this: aa, ax+, ax+ x a+a+, ax, ax is that right? this was what was confusing me. oh no the + was standing for another gene right? lol so it should be like this separated?: aa, ax, +a, x+ x a+, a+, ax, ax.. uhh.. im lost, it doesnt show that in the square.. can you tell me what i mean? lol and here's the url of the page im looking at:
http://ballpython.com/page.php?topic=genetically3
You're on the right track. The a|a are just the possible genes that each parent can pass on. Since each parent only passes on one of the two genes that they carry, the punnet squares are set up like so: A|A for a normal, A|a for a het, and a|a for a homozygous recessive.
With double het parents, this gives four different possibilities for which genes they pass on. So the parents are AaXx (X signifying the axanthic gene), but each parent can pass on AX, Ax, aX, or ax, that's where the odds come into play with the punnet square 1/16 chance of AAXX (normal), and of aaxx (snow).
-Evan
Re: Double Recessive Traits? How does that work?
how do you spread out the gene with 4 alleles onto the punnet square? on the web site im on they have the gene CcGg and its spread onto a 4 by 4 square which looks like this: CG|Cg|cG|cg how did that haopen? lol it seems like something really easy but i dont see how they did it..
Re: Double Recessive Traits? How does that work?
in the one you are asking about with all the +'s and x's this is what is meant (a+,a+) X (a,a) In this case a+ is being used to show the dominant trait (the normal) the a is used to represent the albino. The X is to show the two were crossed. It is the same as the other squares shown on the one of the other links, only they are using a and a+ instead of a and A. maybe that helps some.
Re: Double Recessive Traits? How does that work?
how come in a punnett square for offspring of a albino and axanthic their genetics would look like this?: Albino x Axanthic: aaax+ax+ x a+a+axax.. why would this: aaax+ax+ represent albino? or how would that work?
Re: Double Recessive Traits? How does that work?
first off it would be alot easier to use different letters for different traits. Secondly, the way they get the combinations is each parent has two copies of each gene. Only one copy of each gene is passed on to each baby (go look up mitosis and meiosis that may help explain that part) The 4 combinations are the 4 possible ways for those 2 sets of genes to mix. Lets say the parent has A a and X x. One copy of each gene is passed on to the off spring so you take the first copy in the first pair, and put it with the first copy in the second pair (A X) then you do the first copy from the first pair with the second copy from the second pair (A x) Then you do the same thing for the second copy in the first pair (a X) and (a x). Anyway, go look up mitosis and meiosis, and find a good visual explination of that and this should all make alot more sence.
Re: Double Recessive Traits? How does that work?
Quote:
Originally Posted by BaLLPAddICT
how do you spread out the gene with 4 alleles onto the punnet square? on the web site im on they have the gene CcGg and its spread onto a 4 by 4 square which looks like this: CG|Cg|cG|cg how did that haopen? lol it seems like something really easy but i dont see how they did it..
Excellent Question.
It is called independant assortment.....Evan explained it well in one of his previous posts......I have nothing to add expect an animation. Pictures help....but moving pictures really help to understand biological processes!
See http://www.sumanasinc.com/webcontent...ssortment.html
Click narrated.
