# Chi- squared test

1. Apr 12, 2010

### leah3000

1. The problem statement, all variables and given/known data

In a cross between two types of pea plants, one heterozygous for the round yellow seed condition, and the other, pure breeding with wrinkled green seeds, the following offsprings were recorded;

Round yellow peas-- 108
Round green peas-- 102
Wrinkled yellow peas--105
Wrinkled green peas-- 101

2. Relevant equations

$$\chi$$ ^2 = $$\Sigma$$ {O-E)^2 / E}

The ratio of a heterozygous cross with a homozygous recessive

3. The attempt at a solution

I calculated the value of $$\chi$$ ^2 to be 0.28. The degrees of freedom= no. of categories-1 = 3.

I'm a little bit confused on how to relate the calculated value of $$\chi$$ ^2 to the probability value in the distribution table.

I took the probability value as > 0.1 and got 6.25 according to the data in the table. I'm now assuming that it isn't a significant deviation as the value of $$\chi$$ ^2 is much smaller than this (0.28).

Can someone please explain this if I'm on the wrong track. Thanks