Really grateful for posting a beautifully explained video
@revisnow
11 ай бұрын
Glad you found it helpful!
@humhadidas896
Жыл бұрын
Thank you so much, this is an insanely good explanation with a perfect pace.
@revisnow
Жыл бұрын
Glad to hear that!
@user-pv9qt2yk8c
5 ай бұрын
great explanation
@banushasathi3526
Жыл бұрын
Thank you so much Really Really helpful. love your teaching way.
@revisnow
Жыл бұрын
It's our pleasure! We're glad you were able to benefit from our video!
@kennethsimposya4474
2 жыл бұрын
Thank you very much, you really made my life easier 🤝
@dazelid447
2 жыл бұрын
¡Muchas gracias!
@roopkaran99
2 жыл бұрын
very well thank you so much ! im gonna rely on ur videos to pass
@alexawing3988
Жыл бұрын
test is tomorrow and I just learned the material in 16 minuets😍
@revisnow
Жыл бұрын
So glad to hear that! May we ask what class your exam is in?
@vijayalakshmijkjayaramanra6254
2 жыл бұрын
Thanks bro!!
@ryeowookimida
2 жыл бұрын
Sorry so the conclusion is that the population is not in hardy Weinberg equilibrium?
@revisnow
2 жыл бұрын
Yes- the null hypothesis (which would follow the expected frequencies from the Hardy Weinberg model) is rejected due to the high chi-squared value greater than the critical value for that particular confidence level and degrees of freedom. Since the observed frequencies are significantly different than the expected frequencies (as shown by the GOF chi-squared analysis), the population does not fit Hardy Weinberg equilibrium
@ryeowookimida
2 жыл бұрын
@@revisnow thank you so much!!!
@reinrestrivera2264
2 жыл бұрын
After calculating the frequencies of pocket mice and bird predators after natural selection in a dark environment, it gave me a Chi square value of 0.000001. what does this mean?
@revisnow
2 жыл бұрын
Hi there! Generally, such a low chi-squared value means that there is very little difference between the expected and observed values. At this point, we would search for the critical value on a chi-squared table for a particular significance level (usually for p=0.05) and degrees of freedom (df) in accordance with the situation. If your calculated chi-squared value is greater than the critical value found on the table, we reject the null hypothesis and accept the alternative hypothesis. Otherwise (which is likely in your case where the chi-squared value is very very small and the differences between the observed and accepted values are thus very very small), we cannot reject the null hypothesis. In this case, I like to think of it as "the differences between observed and expected are not big enough to be statistically significant."
@reinrestrivera2264
2 жыл бұрын
@@revisnow Hi! Thank you so much for your reply. So if a question like "Which stimulation do you think evolution is occurring" do we look for lowest chi-square value if your comparing it to others?
@avibrockman2037
Жыл бұрын
Why cant you just find q^2 by diving 100 by 10 and then square rooting to find q. This is how to begin many Hardy-Weinberg problems but causes trouble during the chi-squqared
@revisnow
Жыл бұрын
You're correct! I had the same thought process initially, which is why I couldn't seem to figure out the correct answer at first. The key lies in the fact that we are conducting a hypothesis test. When we find the expected individuals for each phenotype, we use expected values for p^2, 2pq, and q^2 as you can see in the table I've drawn rather than the experimental values. That's the whole point of doing the chi-squared test: to see whether the observed numbers are really "different enough" from the expected numbers. Perhaps I could have explained that better in the video. I hope that answers your question!
@mercurydalo3514
2 жыл бұрын
Thank you, just one question why we add Aa to the AA when we find the frequency of P
@revisnow
2 жыл бұрын
p is the frequency of the dominant ALLELE. So Aa contains one copy of the dominant allele and AA contains two copies of the dominant allele. That is why we must consider Aa in addition to AA for p.
@parthopaul3953
Жыл бұрын
Can I please get the pdf copy?
@revisnow
Жыл бұрын
Hi! Unfortunately we haven't created a PDF with the contents of this video. However, if you need some notes, we can suggest a few things. First, feel free to take screenshots and compile them in a document. Better yet, we encourage you to take notes as you watch the video to better comprehend and retain the information. And finally, if you wish to make it look nicer, we encourage you to use LaTeX or other software to type up the notes. Take care and thanks for watching!
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