Population Genetics & Hardy-Weinberg
Population genetics is the study of genetic variation within populations and how gene frequencies change over time due to factors like mutation, selection, migration, and genetic drift. The Hardy-Weinberg principle provides a mathematical model to predict allele and genotype frequencies in a non-evolving population, assuming conditions such as random mating and no evolutionary forces. Deviations from Hardy-Weinberg equilibrium indicate that evolutionary processes are influencing the population's genetic structure.
Population Genetics & Hardy-Weinberg
Population genetics is the study of genetic variation within populations and how gene frequencies change over time due to factors like mutation, selection, migration, and genetic drift. The Hardy-Weinberg principle provides a mathematical model to predict allele and genotype frequencies in a non-evolving population, assuming conditions such as random mating and no evolutionary forces. Deviations from Hardy-Weinberg equilibrium indicate that evolutionary processes are influencing the population's genetic structure.
💡 Key Takeaways
- Explore how mutation, selection, migration, and genetic drift alter gene frequencies over time.
- Master the Hardy-Weinberg principle as the baseline model to predict allele and genotype frequencies in an ideal population.
- Use p and q to denote allele frequencies and calculate genotype frequencies with p^2, 2pq, and q^2.
- Understand the Hardy-Weinberg assumptions (no mutation, random mating, large population, no migration, no selection) and how violations drive evolution.
❓ Frequently Asked Questions
What is population genetics?
The study of genetic variation within populations and how allele frequencies change over time due to mutation, natural selection, migration, genetic drift, and mating patterns.
What is the Hardy-Weinberg principle?
A mathematical model that predicts how allele and genotype frequencies should be distributed in a large, randomly mating population with no evolutionary forces acting (a non-evolving population).
What conditions are required for Hardy-Weinberg equilibrium?
Very large population size, random mating, no mutation, no migration, and no natural selection.
How are genotype frequencies calculated from allele frequencies?
For a bi-allele locus with frequencies p and q (p+q=1), genotype frequencies are p^2 (homozygous for one allele), 2pq (heterozygous), and q^2 (homozygous for the other). Example: p=0.6, q=0.4 → 0.36, 0.48, 0.16.