Effects of selection on allele and genotype frequencies

This app allows you to explore how natural selection on phenotypes affects the frequencies of alleles and genotypes in populations.

Genotypes

	RRR homozygotes	RSHeterozygotes	SSS homozygotes
2. Initial parent genotype frequenciesGeneration 0 - parent generation at birth, before selection, calculated from initial allele frequencies using Hardy-Weinberg.	p²	2pq	q²
3. Relative fitnesses (w_i)Relative fitnesses for the genotypes	Relative fitness of RR	Relative fitness of RS	Relative fitness of SS
4. Freq. x fitnessGenotype frequencies multiplied by relative fitnesses
5. Average population fitness (w̄):Weighted average fitness - sum of the Freq. x fitness values	0.95
6. Genotype frequencies of breeders:Genotype frequencies after selection, of the actual breeders. Calculated as Freq. x fitness divided by w̄			↘Used to calculate allele frequencies of gametes.

8. Offspring genotype frequencies:Generation 1 - offspring generation at birth, using allele frequencies of gametes, Hardy-Weinberg formulas	Gamete p²	Gamete 2pq	Gamete q²

Each generation serves as the parents for the next generation.

Alleles

	pFrequency of the R allele	qFrequency of the S allele
← Used to calculate initial parent genotype frequencies 1. Initial allele frequenciesInitial frequencies of alleles for parents at their birth		Initial frequency of S allele (equal to 1-p)




↙Used to calculate offspring genotype frequencies 7. Allele frequencies of gametesAllele frequencies of gametes produced by breeders, after selection	Frequency of RR + Frequency of RS/2	Frequency of SS + Frequency of RS/2

Number of generations: