How to calculate allele frequency in the F2 generation

[@naemhossen505]

I am a Vet. science student from Bangladesh. Thanks, I am greatly benefited by Your lecture.

[@GeneticsLessons]

Thanks and welcome

[@kabilhossain2576]

No need to large calculation... Here just want the frequency of recessive b allele in a population one generation after selection! We know, Change frequency q1(b)=(q_sq^2)÷(1-sq^2) Here, s= selection coefficient q=gene frequency of b allele before selection We know, Selection coefficient+ relative fitness= 1 Or, s+ r.f= 1 So, s =1-r.f=1-.4=.6 Now, New frequency q1(b) =(1-.6*. 7^2)÷(1-. 6*.7^2)= .575 So the new freqyency of b allele one generation after selection=.575

[@omolajadeborah4881]

I don't understand this oo

[@GeneticsLessons]

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[@smartstudy5485]

How will you explain this question! How Hardy Weinberg law is related to one locus and two alleles?

[@GeneticsLessons]

I have many videos about that - just check my play list "Population genetics"

[@maryamsediqi3625]

Sir do you have a vedio about the estimation of mutant allele frequency? If yes please tag the link i really need it. 🙏🏻

[@GeneticsLessons]

Yes, check my channel for "Hardy-Weinberg".

[@shaboatrad4066]

What does the selection mean here?

[@GeneticsLessons]

Slection, in biology, the preferential survival and reproduction or preferential elimination of individuals with certain genotypes (genetic compositions), by means of natural or artificial controlling factors.

[@shaimanajmadeen7553]

How genetic variation allows organisms to survive?

[@GeneticsLessons]

It helps a POPULATION to survive and not one particular organism.

[@grossguy9570]

How is this problem different if you're taking into account finding the expected frequencies for zygotes vs. adults? Strong selection is one possible reason for a population deviating from Hardy-Weinberg equilibriumgenotype frequencies. In an infinite population of two-spotted spider mites, there is a bi-allelic locus with two alleles, A and a. Allele A is completely dominant to the a allele. Spider mites are sexually reproducing, have non-overlapping generations, random mating and equal reproductive success. However, there is differential viability among embryos such that aa individuals survive to reach reproductive age at 80% the survival rate as AA individuals. a) If the frequency of the A allele is 0.7 A in generation 1 adults, what are the expected frequencies of the three genotypes in generation 2 zygotes?(2 points) b) What are the expected genotype frequencies of generation 2 adults?(2 points) c) What is the frequency of the A allele in the generation 2 adults? (2 points). This is part of the problem just to get an idea of what I mean. I don't need the answer just need to know what the differences is.

[@grossguy9570]

I think that part a is what you did and i know reproductive adults are p' but i don't get how to solve for p'.

[@GeneticsLessons]

If you will take a look at a playlist "population genetics" on my channel you will find videos that will help you to solve this problem and answer all the questions.

[@Tamilanimationstories]

Thank u.. U saved me.. Got answer for my assignment

[@GeneticsLessons]

You're welcome! Thanks for watching.

[@Tamilanimationstories]

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[@whysoserious6581]

I am here for the first time and you are brilliant in explaining everything... I would also like to give you some questions from genetics which I am not able to solve and haven't found any answer from any sources... I would be grateful if you could help me.. please reply. Xoxo☺️

[@GeneticsLessons]

You can post your questions and answers if any under any of the videos.