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? ________________________________
