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jessicawcu jessicawcu
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10 years ago
Here is a question from my bio homework:

At a local buffalo farm an albino calf named Snowball is born. Snowball is the first albino buffalo born to this herd. The allele for albinism is recessive to the allele for normal coloration. Snowball’s mother, Bessie, is of normal pigmentation. For future breeding purposes, the owner of the farm is very interested in which of his three normally pigmented bulls (Scout, Chief, or Thunder) is the father. The farmer hires an animal genetics company to determine the father of Snowball. The company takes samples from Snowball, Bessie, and the three potential sires, and creates DNA fingerprints.
Analyze the results of the tests below and answer the questions about which bull is Snowball’s father.


My thought is that Thunder is the father bc of the 2kb strand. 

Scout cannot be the father of Snowball becasue in the 10 kb strand Scout has a DNA that is not present in Snowball's DNA.  Snowball also has a DNA segments in 8kb and 2kb that Bessie and Scout would be unable to donate.

Chief cannot be the father of Snowball because in the 2kb strand Snowball has DNA present that was not donated by Bessie.  Chief is not the father because he is also unable to donate the DNA.

Anyone agree or disagree?
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wrote...
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Valued Member
10 years ago
You are correct.  Here's how you do this:

Look for all the bands that the offspring has that the mother does not have (since she could have given the band, it becomes useless for identification).

That leaves us with 12kb, 8.2 kb, and 2 kb.  The only male with these three bands is Thunder.

Now, whichever potential father has all of those bands must be the father.
OR you can look at it as a process of elimination (like you did): the only father that had the 2kb band was Thunder.  Snowball had it and Bessie didn't, so he is the only one of the three who can be included.  The other two can be excluded.
Pretty fly for a SciGuy
jessicawcu Author
wrote...
10 years ago
Thank you
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3 years ago
Thank you
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3 years ago
Thanks!
wrote...
3 years ago
Thank you
wrote...
3 years ago
Thanks!!
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3 years ago
thank you
wrote...
3 years ago
Thank you very much
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3 years ago
thanks
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3 years ago
Thank You!
wrote...
2 years ago
Thank you
wrote...
2 years ago
Perfect.
wrote...
2 years ago
Great
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