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Feb 20, 2024

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HARDY-WEINBERG PROBLEMS (SHOW WORK) 1. If 98 out of 200 express the recessive phenotype, what percent of the population would you predict would be heterozygotes? (42%) 2. Your original population of 200 was hit by a tidal wave and 100 organisms were wiped out leaving 36 homozygous recessive out of the 100 survivors. If we assume that all individuals were equally likely to be wiped out, how did the tidal wave affect the predicted frequencies of the alleles in the population? (p=0.4; q=0.6) 3. In a population of pea plants, there are 300 tall and 150 short plants. The tall allele is dominant to the short allele. Calculate the frequencies of the tall and short alleles in the population. (p=0.43; q=0.57) 4. 20 years later the population in Q3 now totals 700 plants. Now, 55 are short. Calculate the allele frequencies. Has evolution occurred or has the population simply grown? (p=0.28; q=0.72. Yes, it has evolved because the allele frequencies are different from Q3) 5. The allele y occurs with a frequency of 0.64 in a population of sockeye salmon. Give the frequencies of the genotypes YY, Yy, yy. (YY=0.13; Yy=0.46; yy=0.41) 6. The gene for albinism is a recessive allele. In Michigan, 21 people out of a sample of 10,000 were found to have albino phenotypes. The other 9,979 had normal pigmentation. Assuming Hardy-Weinberg equilibrium, what is the allele frequency of the dominant allele in this population? (p=0.96) 7. A similar survey was carried out in Ca, but only 2500 people were surveyed. Assuming the allele frequencies are the same as in MI, how many people would you expect to have albinism in this sample? (5) 8. Sickle cell anemia is caused by a recessive allele. If 12% of an African population is born with a severe form of the disease (ss), what percentage of the population is heterozygous (Ss)? (46%) 9. You have sampled a population in which you know the percentage of the homozygous recessive genotype is 36%. What is a. frequency of the aa genotype, b. frequency of the a allele, c. Frequency of the A allele, d. Frequency of AA genotype, e. Frequency of Aa genotype? (a. 36% b. 60% c. 40%, d. 16% e. 48%) 10. In a population of butterflies, Brown (B) is dominant over white (b). 40% of the population is white. Find the percentage of butterflies in the population that are heterozygous. What is the frequency of the homozygous dominant individuals? (47% heterozygous; 0.14 freq. of homo dom individuals) 11. In a population of red (dominant allele) or white flowers in HW equilibrium, the frequency of red flowers is 91%. What is the frequency of the red allele? (70%)
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