## Help on a Chi-square problem plz

Genetics as it applies to evolution, molecular biology, and medical aspects.

xcuteJinax3
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### Help on a Chi-square problem plz

On this problem ...

Genetically pure white dogs, when testcrossed to brown dogs, produce an all white F1. Data on 190 F2 progeny: 138 white, 41 black, 13 brown. These coat colors are postulated to be under the genetic control of two loci exhibiting dominance with a 12:3:1 expected ratio. Test this hypotheiss by chi-square.

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I know you use the chi square formula but I seriously have no idea how to solve this. Please help! THANK YOU!!

MrMistery
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What the heck is a chi square? is it like a punnet square?
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

canalon
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Chi square is a statistical test designed to see if a distribution of characters is random or link to some characters. As for how to do it, many software can do that for you (MS excel for example), but you will find on the net plenty of good explanations and examples.
See here for some examples. The first 2 are correct and interesting.
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

sdekivit
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the chi-square test is used to test statistically wether there is a relation between two variables or not.

xcuteJinax3
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Thank you~~I understand now

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