Selection & Microevolution Name ____________

Introduction: Using the Hardy-Weinberg Equation/Looking at Microevolution What are the factors that lead to evolutionary change? Using mathematical equations, Hardy & Weinberg in the early 20th century showed that evolutionary change – measured as changes in allele frequencies in a population from one generation to the next – will not occur unless certain kinds of “evolutionary agents” are affecting the population. The Hardy-Weinberg equation can be used to describe the allele frequencies in populations that are not changing evolutionarily – and also can be used to determine if populations are changing over time.

If there are only two alleles, then: p + q = 1

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The model

In this exercise we will examine the effects of different kinds of potential evolutionary factors on the genetic makeup of simple, model populations.

For this lab, we have two different kinds of populations. We will model one population with colored beads; the other population is modeled with various colors of beans.

Homozygous dom Heterozygotes Homozygous recess

Beads

Dark green

Light green

Yellow

Beans