Table of contents
- 1. Introduction to Genetics51m
- 2. Mendel's Laws of Inheritance3h 37m
- 3. Extensions to Mendelian Inheritance2h 41m
- 4. Genetic Mapping and Linkage2h 28m
- 5. Genetics of Bacteria and Viruses1h 21m
- 6. Chromosomal Variation1h 48m
- 7. DNA and Chromosome Structure56m
- 8. DNA Replication1h 10m
- 9. Mitosis and Meiosis1h 34m
- 10. Transcription1h 0m
- 11. Translation58m
- 12. Gene Regulation in Prokaryotes1h 19m
- 13. Gene Regulation in Eukaryotes44m
- 14. Genetic Control of Development44m
- 15. Genomes and Genomics1h 50m
- 16. Transposable Elements47m
- 17. Mutation, Repair, and Recombination1h 6m
- 18. Molecular Genetic Tools19m
- 19. Cancer Genetics29m
- 20. Quantitative Genetics1h 26m
- 21. Population Genetics50m
- 22. Evolutionary Genetics29m
21. Population Genetics
Hardy Weinberg
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In a random mating population of Drosophila, 5% of the flies have black bodies (encoded by recessive b) and 95% have brown bodies (encoded by B). Assuming Hardy-Weinberg equilibrium what is the allele frequency of B in the population?
A
0.77
B
0.60
C
0.50
D
0.95

1
Identify the given information: 5% of the flies have black bodies, which is the recessive phenotype (bb). This means the frequency of the homozygous recessive genotype (q^2) is 0.05.
Use the Hardy-Weinberg principle, which states that p^2 + 2pq + q^2 = 1, where p is the frequency of the dominant allele (B) and q is the frequency of the recessive allele (b).
Calculate the frequency of the recessive allele (b) by taking the square root of q^2: q = sqrt(0.05).
Determine the frequency of the dominant allele (B) using the relationship p + q = 1. Solve for p: p = 1 - q.
Verify the calculated allele frequency of B by checking if it matches one of the provided options: 0.77, 0.60, 0.50, 0.95.
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Open Question
There are usually five or more colors of candy in each bag. Sort the candies by color, and if your bag has more than four colors, eat the least frequent color or colors. Once that is done, calculate the frequencies of the four remaining colors. Assume these frequencies represent four alleles of a gene, and use the description of the H-W equilibrium for more than two alleles for assistance (Section 20.1).Use this expansion to calculate the expected frequency of each possible genotype produced in a randomly mating population.