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I Need Help Again! -gyork99

  Author:  39343  Category:(Discussion) Created:(4/3/2002 7:44:00 PM)
This post has been Viewed (203 times)

I could use a little help on a problem again. Won't bore you with details though...

2. Two laboratory mice aremated several times over many years. Data collected on their offspring indicate that 84 were gray (Note: Dominant) and 27 were white. (Note: Recessive) What were the genotypes and phenotypes of the two parent mice? (HINT: Consider the ratio involved here.)

Genotypes: ____-g___ X ____-g_____

Phenotypes: _____________ and _______________

Good luck....-gyork99

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Spring is coming

Replies:      
Date: 4/3/2002 7:46:00 PM  From Authorid: 10245    huh???  
Date: 4/3/2002 7:54:00 PM  From Authorid: 11341    glad im not in school anymore :P  
Date: 4/3/2002 7:55:00 PM  From Authorid: 35178    i would say that they were both Gg and they were and the phenotypes are both gray b/c of dominance..and the 3:1 ratio, the punnett square gives three gray and one white this way.  
Date: 4/3/2002 7:57:00 PM  From Authorid: 10245    again.... HUH? (what language is that???) LOL  
Date: 4/3/2002 7:59:00 PM  From Authorid: 11341    im with you mercury lolol  
Date: 4/3/2002 8:07:00 PM  From Authorid: 47699    George Jones and Tammy Wynette? Dolly Parton and Porter Waggoner? The Judds? Sorry, but you lost me ages ago. I wish I could be of help here.  
Date: 4/3/2002 8:15:00 PM  ( From Author ) From Authorid: 39343    Sometimes I wonder why I even bother learning it in the first place....  
Date: 4/4/2002 7:55:00 PM  From Authorid: 42519    ok.... lets say that GG is gray and gg is white... you make a box and put Gg down one side, and Gg on the top.... thus making 4 squares.. **Note, I dont know if you have gone through this, but this is the way i learned it** so you combine the boxes... so now you have 4 boxes with GG, Gg, Gg, and gg...anything with a big G is going to be gray, and all with gg are going to be white... thats where your ratio comes from... so its 1/4 mice are going to be white. So your parent mice have got to be a Gg and Gg for male and female... if one was Gg and gg, then the ratio would be different cuz then you have a half chance of getting white babies, making the ratio off, :42 out of 84, or in that ballpark area. so the Genotype is Gg and Gg... I cant remember Phenotype, if you could throw me a definition, I might could tell ya.  

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