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Hardy-Weinberg Principle: Practice Problems & Applications, Lecture notes of Theory of Evolution

Problem 3: In a population that meets Hardy-Weinberg equilibrium, the dominant allele frequency (A) is 0.7. What is the frequency of homozygous recessive ...

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2021/2022

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YOUR NAME: _________________________________________ Periods: ______ Date: _______________
Group Members’ Names: ___________________________________________________________________
Hardy-Weinberg Practice Problems
Show your work for the following problems. Round answers to the third decimal place. When showing your work, draw
a square around your answer in addition to writing it on the line provided.
1. A population of rabbits may be brown (the dominant phenotype) or white (the recessive phenotype). Brown rabbits
have the genotype BB or Bb. White rabbits have the genotype bb. The frequency of the BB genotype is .35.
a. What is the frequency of the B allele? ____________________________________
b. What is the frequency of the b allele? _____________________________________
c. What is the frequency of heterozygous rabbits? ____________________________
2. A hypothetical population of 10,000 humans has 6840 individuals with the blood type AA, 2860 individuals with
blood type AB and 300 individuals with the blood type BB.
a. What is the frequency of the AA genotype in this population? _________________
b. What is the frequency of the AB genotype in this population? _________________
c. What is the frequency of the BB genotype in this population? _________________
d. What is the frequency of the A allele? ____________________________________
e. What is the frequency of the B allele? ____________________________________
f. If the next generation contained 25,000 individuals, how many individuals would have blood type BB, assuming
the population is in Hardy-Weinberg equilibrium? __________________________
3. A population of birds contains 16 animals with red tail feathers and 34 animals with blue tail feathers. Blue tail
feathers are the dominant trait.
a. What is the frequency of the red allele? _________________________________
b. What is the frequency of the blue allele? ________________________________
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YOUR NAME: _________________________________________ Periods: ______ Date: _______________

Group Members’ Names: ___________________________________________________________________

Hardy-Weinberg Practice Problems Show your work for the following problems. Round answers to the third decimal place. When showing your work, draw a square around your answer in addition to writing it on the line provided.

  1. A population of rabbits may be brown (the dominant phenotype) or white (the recessive phenotype). Brown rabbits have the genotype BB or Bb. White rabbits have the genotype bb. The frequency of the BB genotype is .35. a. What is the frequency of the B allele? ____________________________________

b. What is the frequency of the b allele? _____________________________________

c. What is the frequency of heterozygous rabbits? ____________________________

  1. A hypothetical population of 10,000 humans has 6840 individuals with the blood type AA, 2860 individuals with blood type AB and 300 individuals with the blood type BB. a. What is the frequency of the AA genotype in this population? _________________

b. What is the frequency of the AB genotype in this population? _________________

c. What is the frequency of the BB genotype in this population? _________________

d. What is the frequency of the A allele? ____________________________________

e. What is the frequency of the B allele? ____________________________________

f. If the next generation contained 25,000 individuals, how many individuals would have blood type BB, assuming the population is in Hardy-Weinberg equilibrium? __________________________

  1. A population of birds contains 16 animals with red tail feathers and 34 animals with blue tail feathers. Blue tail feathers are the dominant trait. a. What is the frequency of the red allele? _________________________________

b. What is the frequency of the blue allele? ________________________________

c. What is the frequency of heterozygotes? ________________________________

d. What is the frequency of birds homozygous for the blue allele? ______________

  1. Brown hair (B) is dominant to blond hair (b). If there are 168 brown haired people in a population of 200: a. How many people in the population have blond hair? ______________________

b. What is the predicted frequency of homozygous recessive? _________________

c. What is the predicted frequency of homozygous dominant? __________________

d. What is the predicted frequency of heterozygotes? _________________________

  1. 1 in 1700 US Caucasian newborns have cystic fibrosis. C is the normal allele, dominant over the recessive c. Individuals must be homozygous for the recessive allele to have the disease. a. What frequency of cystic fibrosis in the above population? __________________

b. Assuming a Hardy-Weinberg Equilibrium, how many newborns would have cystic fibrosis in a population of 10,000 people? _____________________________________________________

  1. The ability to taste PTC is due to a single dominant allele (T). You sampled 215 individuals in a biology class, and determined that 150 could detect the bitter taste of PTC and 65 could not. a. What is the predicted frequency of the recessive allele? ___________________

b. What is the predicted frequency of dominant allele? _____________________

c. In a population of 10,000 people, how many would be: Heterozygous (assuming Hardy-Weinberg equilibrium)? _____________________

Homozygous dominant? _______________________________________________

Homozygous recessive? _______________________________________________