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Long x Short

F1

All Long

F2 Phenotypes

787 long, 277 short

1. What is the expected value for the recessive phentotype of the cross Long versus Short

787+277= 1064

I did 787/1064= .739 Rounded up to .74 For Long

277/1064= .26 for Short

.74x1064=787.36Is the Expected value for Long. But this answer is somehow wrong in the system. I'm just trying to see if the system has an error because I don't see how it can be wrong.

2. What is the Chi Square Sum (rounding to 3 significant figures) for Long versus Short cross.

Long- (787-787.36)^2/787.36= 1.64E-4

Short- (277-276.64)^2/276.64= 4.68E-4

Add those number and I get 6.32E-4 which seems very wrong.

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# Homework Help: Chi Square Analysis of Phenotype Problem

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