Chi Square....HELP!!?

Question

my data:

Green = 33
Albino = 8
Total = 41

I need to find the expected for both.

Answer 1

Well, you need to propose a mechanism for these results, either based on your knowledge, or on some other part of the question. For example, green might be the dominant trait and albino the recessive, and these results are the F2 generation of a cross between an albino and a green...

If that's the case, then you would have expected a 3:1 ratio.
So, 3/4 of 41 = 30.75 and 1/4 of 41 = 10.25

Answer 2

Perhaps you want to perform a statistical test to determine if the proportions in the two groups are similar? Often you do this with a "chi-square" test where you compute the look at the observed minus the expected values under some null hypothesis (usually that the proportions are the same).

Under the null hypothesis that the proportion in each group is the same:

Green: observed=33, expected=(0.5)(41) = 20.5
Albino: observed=8, expected=(0.5)(41) = 20.5

A chi square statistic is computed by summing the squares of the differences in the observed and expected values divided by the expected. See the link below.

Answer 3

The expected isn't calculated based on the experimental data. So we can't give it to you, without knowing more.

It's calculated based on a hypothesis. Your data sounds like a cross, so figure out the "ideal" cross percentages if you did it with a Punnett square, and multiply by 41.