Q1.3. How do the frequencies of allele S in the Breeding Pens compare to the frequency of allele S among ferrets in the field population? They are exactly the same as the field population's frequency. They are nearly the same as the field population's frequency (within 10%). They vary, and some are fairly different from the field population's frequency. Check Answer Q1.4. How did the frequencies of allele S in the pens come to be different from the frequency in the field? Just by chance, I happened to grab a different collection of genotypes for each pen. In some pens, selection favors allele S; in other pens selection favors allele C. When I selected ferrets to move, I adjusted my choices so that the allele frequencies would be different in each pen. Check Answer
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Count S alleles (SS contributes 2, SC contributes 1, CC contributes 0) and divide by the total number of alleles (2 × number of ferrets). p_S(field) = (2·#SS + 1·#SC) / (2·N_field). Show more…
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Review of equations: If p is the frequency of the dominant allele and q is the frequency of the recessive allele: Hardy-Weinberg equation (= the genotype frequency equation): p2 + 2pq + q2 = 1 Allele frequency equation: p + q = 1 NOTE for all work below: - Use decimal numbers for frequencies (rather than %). - Write your answers to two (2) decimal places. Data : total # of students in class = __19____ phenotype counts for class: # with unattached (free) earlobes (EE and Ee genotypes) = __15____ # with attached (no lobe) earlobes (ee genotype) = __4_____ Calculating frequencies of genotypes and alleles: q2 = frequency of attached = (# with attached) / (total # of students) = ________ q = frequency of e allele = ________ p = frequency of E allele = 1 - q = ________ p2 = frequency of EE genotype = ________ 2pq = frequency of Ee genotype = ________ Which allele is more common in this case — the dominant or the recessive?
Bryan V.
What is the first step when determining frequency for either alleles or genotypes? What will always be the same for all frequency calculations no matter how the actual numbers of alleles or genotypes differ? Hardy-Weinberg Principle If the frequency of the dominant allele is 0.6, what is the frequency of the recessive allele? (Hint: use the "Allelic frequency" formula) If the frequency of the homozygous recessive genotype is 0.64, what is the frequency of the dominant allele? (Hint: See Hardy-Weinberg example #1) If the frequency of the homozygous dominant genotype is 0.36, what is the frequency of the homozygous recessive genotype? If the frequency of the recessive allele in the gene pool is 0.15, predict the frequency of the three possible genotypes. (Hint: Use the "Allelic Frequency" formula, and then the "Genotypic Frequency" formula.)
1. This Hardy-Weinberg equation, p2 + 2pq + q2 = 1, means ___________________. The sum of genotype frequencies equals to 1. The sum of allele frequencies equals to 1. A population is under genetic equilibrium. Population size remains constant over generations. 2. In the Hardy-Weinberg equation: p2 + 2pq + q2 = 1, what does the term q represent? Frequency of the dominant genotype Frequency of the recessive allele Frequency of the recessive genotype Frequency of the heterozygous genotype 3. Assuming allele B is the dominant allele, b is the recessive allele. There are 40 students in a class and 10 of them have recessive genotype. What is the frequency of allele b? 0.25 4 0.5 Cannot be determined 4. In the Hardy-Weinberg equation: p2 + 2pq + q2 = 1, what does the term q2 represent? Frequency of the dominant allele Frequency of the recessive allele Frequency of the recessive genotype Frequency of the heterozygous genotype 5. In the Hardy-Weinberg equation: p2 + 2pq + q2 = 1, what does the term 2pq represent? Frequency of the recessive allele Frequency of the dominant genotype Frequency of the recessive genotype Frequency of the heterozygous genotype
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