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Hardy-Weinberg Problems name___________________________hr__ Show work on separate paper & staple to back of this sheet. 1. In a population of 100 individuals 49% are of the NN phenotype. What percentage is expected to be Nn assuming Hardy-Weinberg equilibrium? A. 9% B. 21% C. 42% D. 51% E. insufficient information to answer question 2. Attached ears is an autosomal recessive trait in humans. Assume that there are 400 people with attached ears in a population of 10,000. How many individuals would be expected to homozygous dominant? A. 800 B. 100 C. 6400 D. 200 E. 10,000 3. In a population that meets the H-W equilibrium assumptions, 81% of the individuals are homozygous for a recessive gene. What percentage of the individuals would be expected to be heterozygous for this gene? answer: 4. A farmer bought a herd of 600 sheep, taken from a freely breeding population, and later found that 150 of the animals had an economically undesirable feature, crinkly-hair, caused by the recessive allele c. What is the frequency of this undesirable allele in the herd? answer: B.What proportion of the herd is likely to be heterozygous? answer: 5. The alleles for red and white coat color in cattle show incomplete dominance, the heterozygote being roan. In a freely breeding herd of 1000 head how many would you expect to be of each coat color if the allele for white coat has a frequency of 0.4? answer: Hardy-Weinberg Problems name___________________________hr__ 6. In a sample of 2400 births at a maternity hospital, six babies died shortly after birth from the effects of a recessive gene (c) for colonic obstruction. A.What is the frequency of this gene in the population? answer: B.What proportion of the population is heterozygous and what proportion is homozygous for the normal allele? answer: For the next three problems calculate the frequency of the three genotypes. Also calculate the hypothesized actual number of the genotypes and the phenotypes. 7. A herd of 300 cows (+ a few bulls) with 12 homozygous recessive individuals. answer genotypes: answer phenotypes 8. A school(?) of 86 sea cows includes 24 individuals which have a recessive skin disorder causing them to be fluorescent yellow. answer genotypes: answer phenotypes: 9. A flock of 125 scarlet macaws that includes 15 individuals with gold colored feathers (a recessive mutation). answer genotypes: answer phenotypes Determine the allele frequency of the current group of individuals, calculate the expected genotypic frequencies and the frequency of each phenotype. 10. A flock of 342 scarlet ibis that includes 102 individuals with green colored legs (a dominant mutation). answer: