PopG plot 1.0 - Fixed: 1 0.9 - 0.8 - 0.7 - 0.6

PopG plot 1.0 - Fixed: 1 0.9 - 0.8 - 0.7 - 0.6 - P(A) 0.5 - 0.4 - 0.3 - 0.2 - 0.1 - 0.0 - Lost: 0 0 10 20 30 40 50 - evolving populations - with no drift Generation When an allele becomes "fixed", this means that everyone in the population has it. When one of the alleles becomes fixed (frequency = 1), and the other one disappears (frequency = 0), what happens to heterozygosity? H = 2*p*q = __________ So what, then, is the effect of genetic drift on the amount of genetic diversity within a population? Note that the change you observed was the result of random genetic drift. If this process was repeated many times, each time using the new offspring population to populate the next generation, heterozygosity would slowly decrease until eventually only one allele would remain, at which point heterozygosity would be zero.

Transcript

00:01 Hi, the question has given us a plot called fog plot.

00:05 Okay, what does pog plot mean? it means population genetics plot, okay? population genetics plot.

00:16 So what, it is a kind of software, okay, which is used, that is run to determine the effect of random genetic drift, okay? random genetic drift that happens in a population, okay? this is what we are studying using this plot, okay? so, in this software, we give certain parameters such as population size, number of generations, the frequency of the alleens, etc.

00:52 And we determine the effect of the random genetic drift on the population, okay? so let's just see the graph.

01:01 So this is the graph.

01:03 This is an approximate graph.

01:05 I have drawn this.

01:06 So just ignore the exact measurements.

01:11 So i shall explain what the graph is.

01:15 This pa, right? this pa represents the frequency of allele a.

01:21 Allel a is capital a.

01:23 Okay.

01:24 The capital a, that is dominant.

01:26 Okay.

01:26 And this x -axis represents the generation, okay, number of generations.

01:32 So we have here till 50th generation, okay? and the straight line, right, it represents there is no genetic drift happening.

01:42 So let's just say it can act as a control, okay? and we can see that the graph starts from 0 .5, okay? so here the parameters that we have set is 0 .5 is the, initial frequency of allele.

02:00 Okay? frequency of allele.

02:03 So from here the graph starts.

02:05 So from this, we can say that if the graph goes above 0 .5, then the frequency of capital is more and frequency of capital, sorry, small a is less.

02:19 Okay.

02:20 And if it goes below 0 .5, then we can say the frequency of capital a is less and the frequency of capital small a is high okay because we know like p plus q is equal to one right so if p is higher then the q will be rowing p is the frequency of both are these let's say this is capital a and this is small a so if capital a frequency is going up then the small a frequency will go down and vice versa okay so it all it should always be equal to one okay, so from this, we can say that around 10th generation, after the 10th generation, the frequency of capital a is getting high and high, and each passing generation, and after around 35th, approximate 35th generation, it has reached the point 1...

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