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# Model experiment 4. Modeling the effect of random processes on the genetic structure of the population, modeling the drift of genes *

• Put the chips in the package and mix them.
• Without looking into the package, get 2 chips and put them in one of three pockets: the first - a pair of red chips, the second - pairs of red and white, the third - a pair of white chips. Do this until you remove all the pieces from the package. This is how the genetic structure of the parent population is modeled.
• Calculate the number of paired chips in each pile. Enter the results in the row for the parent population P1 of table 5.
• Collect all the chips in one package, mix. Without looking into the package, get 5 pairs of chips from it in turn and put each of the pairs in one of the three packs. Put all other pieces separately. Thus, the process of survival of 1/10 part of the population is modeled.
• Calculate the number of paired chips in each pile. Enter the results in the row for the parent population of P2 of table 5.
• Bearing in mind that each individual gives 4 gametes, put in the package the appropriate number of chips (20 chips).
• Repeat steps 2 and 3 once more. Enter the results in a row for F1 of table 5. This simulates the genetic structure of the first generation population after a natural disaster.
• Calculate the frequency of genotypes and genes in each population, fill in the table 5.
• Formulate the conclusion according to the plan:
• the ratio of frequencies of genotypes in the population;
• ratio of gene frequencies in a population;
• the direction of evolutionary change.

# Table 5. Genetic structure of the population at random factors on the genetic structure of the population

 Population Number of individuals Distribution of genotypes Gene frequencies АА Аа аа А(p) a(q) 1 2 3 4 5 6 7 8 9 10 P1 Calculate P2 Calculate F1 Calculate F2 Calculate F3 Calculate F4 Calculate
Note: Gene frequencies are calculated automatically by the method of extracting square roots from the frequencies of homozygotes.
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