I am very confused about how to find the critical value of the test statistic. I have...

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Statistics

I am very confused about how to find the critical value of thetest statistic.

I have found the test statistic of 5.636, with 1% significancelevel and two degrees of freedom. How do I calculate the criticalvalue?

Geneticists examined the distribution of seed coat color incultivated amaranth grains, Amaranthus caudatus. Crossingblack-seeded and pale-seeded A. caudatus populations gave thefollowing counts of black, brown, and pale seeds in the secondgeneration.
Seed Coat Colorblackbrownpale
Seed Count3476836

According to genetics laws, dominant epistasis should lead to  
12
16
  of all such seeds being black,  
3
16
  brown, and  
1
16
  pale. We want to test this theory at the 1% significancelevel.

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