teaches biology at Walter Payton High School in downtown Chicago. Sandwiched between
Chicago's Magnificent Mile on the north side and the city's oldest subsidized housing
development to the south, Walter Payton High School opened in September 2000. By design,
the school admits an equal balance of Caucasian, African-American, and Hispanic students,
drawing from a broad geographic and socio-economic range across the city.
Ms Havlik's biology curriculum follows a blueprint for teaching in the
Chicago public schools, where she has taught evolution for 30 years. Her year in biology
begins with an overview of science as a way of knowing, followed by units on chemistry,
cell structure, energy relations, and DNA.
Before the Lesson
Prior to the gene pool experiment, Ms. Havlik's students learned about the Hardy-Weinberg
equilibrium principle and the conditions under which it is maintained. The day before the
lesson, students read an article on genetic
diseases as an introduction to diseases that can be inherited and those that provide
an advantage in the heterozygous condition.
The Hardy-Weinberg Equilibrium Lesson
Ms. Havlik's lesson demonstrates the Hardy-Weinberg equilibrium principle by simulating
what happens to a gene pool population over time. View Lesson Plan (pdf).
After the Lesson
After the Hardy-Weinberg equilibrium lesson, students were asked to transfer what they
learned to new lessons. The class explored data based on the Galapagos Islands iguana,
identifying differences in organisms of the same species and developing hypotheses about
the relationship between habitat and body characteristics and why the two populations are
different. Students were given data on size, feeding habits, and location of the birds.
The next lesson explored a finch population over a 10-year period. Students were asked to
explain why some finches die and others live. After the genetics unit, the class went on
to study mitosis, genetics, evolution, classification, and ecology.