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?
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Bryan V.
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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