Chi Square Test and Genetic Crosses

During biology labs, you often have to perform a chi-square test to see if observed values are similar to or different from expected values for a set of data. This video describes how to do a simple chi-square test when looking at monohybrid genetic crosses to see if the offspring you observed are similar to what you expected.

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Best lecture of chi square test 👏

[@onabatlleblog579]

This is really helpful since I’m studying an undergraduate biology course. It has really helped me and I hope to see more of such videos . The creator is doing a very explicit job 👍🏻

[@LawrenceNdelemani]

This video is very helpful, thank you so much

[@ManishM-zz5qd]

I have my practical exam tomorrow, and after watching ur video, I feel confident that I can do this in my exam

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thank you for this, i understand it better now

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thank youu cleared it up for me

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I understood well

[@sumitkumarsharma4806]

amazing explanantion. need more videos on genetics

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May God continue to protect your health ❤

[@theodoresweger4948]

Very well done thank you. just for curiosity I have used interpolation and found a P value of .6290 using tables and actual was .60815 using a calculator. Thank you so much.

[@user-m2m5j]

thank you so much

[@nanee03nevergiveup86]

Perfect 🥹👌 Thank you

[@jaredcommey9749]

Thanks it was very helpful

[@LipsaDeep-u9f]

Thank you so much ma'am 😊

[@mngwachifundo]

Can you do a video for dihybrid crosses🙏🙏

[@BiologywithRisa]

I should have a video for dihybrid crosses posted by next week! :)

[@thedathiweerasena6020]

Thank you so much ❤

[@rajattiwari1379]

Amazing

[@ngulubekapembwa]

Thank you ❤ 😊

[@jeontanji]

For chi square test df= (nr-1)×(nc-1) which is here 0.. why is it 1 here then

[@BiologywithRisa]

There are actually two types of Chi Square Tests. There is the Chi Square Goodness of Fit Test which is described in this video, and there is the Chi Square Test of Independence. The degrees of freedom are calculated differently for each. In the Goodness of Fit Test the df = the number of categories - 1. In the Test of Independence, the df = (nr-1)x(nc-1). I hope this helps explain the difference!
The resource below may be helpful:
www.jmp.com/en_us/statistics-knowledge-portal/chi-square-test.html#:~:text=There%20are%20two%20commonly%20used,Chi%2Dsquare%20test%20of%20independence.

[@StillOnMars]

How do you get that table with chi square values???

[@BiologywithRisa]

If you just search online for chi square tables you will find a lot. These are standard tables. They all should have the same values on them.

[@StillOnMars]

@@BiologywithRisa how are P values calculated from X2? What is the formula for P value?

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[@kim01leon]

thank you! this was so helpful!!