BIOL 170 Exploring Biology
Population Genetics
Hardy-Weinberg Sample Problems
Note: If you complete all these problems showing all your work, you may hand these
in as a student selected activity for 10 possible points.
1. In a population of cats there are 84 black cats and 16 white cats. Calculate the
genotype frequencies of these cats?
2. Freckles is a dominant trait (F). In a population of 2500 people, 1600 have freckles.
Calculate the genotypic frequencies of these people for the trait.
3. Within population of butterflies the color brown is dominant over the color white. In
a population of 1200 of these butterflies, 432 are white. Calculate the genotypic
frequencies of these butterflies for color.
4. In the U.S. population about 1 person in 20,000 expresses the recessive trait of
albinism. Calculate the genotypic frequencies of these people for the trait (A).
5. About 8% of American men express the sex linked trait for color blindness. Calculate
the genotypic frequencies of these people for the trait C.