Babynini
  • Babynini
Need help with genetics problems!
Biology
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Babynini
  • Babynini
"A black, rough male guinea pig is mated to a white, rough female. Out of several litters totaling 27 individuals, 9 are black, rough; 7 are black, smooth; 8 are white, rough; 3 are white, smooth. What are the genotypes of the parents? (Hint: list what is given for the parents and offspring first)" Also note that: black color coat (B) is dominant to white (b), and a rough coat (R) is dominant to smooth (r)
Babynini
  • Babynini
If the dad and mom both are: BbRr I know we get the Ratio 9 BR; 3Br; 3 bR; 1br But i'm not sure how that plays into a total of 27 babies? is it safe to say that the geno types are BbRr?!
mtepecz
  • mtepecz
The mom can't be Bb because that would make it black, so what we know for sure is the female is either bbRr or bbRR

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Babynini
  • Babynini
Ah, good point.
Babynini
  • Babynini
If the mom is bbRr and the dad is BbRr we get a ratio 3BR;1Br;3bR;1br
Babynini
  • Babynini
Yeah I think it's Male: BbRr, Female: bbRr does that look correct? :)
Babynini
  • Babynini
Except then the black smooth and white smooth are super close in number..which is not the case.
mtepecz
  • mtepecz
That's true, unless the male isn't BbRr and is instaed BBRr
Babynini
  • Babynini
but that cannot be the case because then we would never get a br
mtepecz
  • mtepecz
Ignore that. It wouldn't work because then all offspring would be all black
Babynini
  • Babynini
haha yeah.
Babynini
  • Babynini
gaah. What is it then? o.o That seems like the closest to the wanted results.
mtepecz
  • mtepecz
So the parents would be BbRr and bbRr.
Babynini
  • Babynini
And the genotypes: Male: BR, Br, bR, br Female: bR, br
alphadxg
  • alphadxg
Yeah I think it's Male: BbRr, Female: bbRr does that look correct? :) I agree with this.
Babynini
  • Babynini
Yay! thanks you guys. Yall want to have fun and do more? xP
alphadxg
  • alphadxg
;)
mtepecz
  • mtepecz
Sure why not, I'm a bio major for a reason.
Babynini
  • Babynini
xD ok so it's with the same guinea pig thing. BBRR x bbrr: Phenotype: ? Genotype: ?
Babynini
  • Babynini
So.. I think Phenotype: BR, br Genotype: BbRr is that how that works?
alphadxg
  • alphadxg
post it on a new post, close this one.
mtepecz
  • mtepecz
Correct!
Babynini
  • Babynini
yay!

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