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Q-Q plot for p-value from HWE exact test

Dear All,

I tried to plot Q-Q plot, using p-values from HWE exact test. This is my result:

my q-q plot

It seems that left tail looks strange. The reason is that there are a lot of SNPs with p-value=1. But I know that graph should looks like this:

example q-q plot

I'm interesting what is the problem?

q-q plot hardy-weinberg p-value gwas qc

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