Name: Katie Hebert
Student Exploration: Hardy-Weinberg Equilibrium
Directions: Follow the instructions to go through the simulation. Respond to the
... [Show More] questions and prompts in the
orange boxes.
Vocabulary: allele, genotype, Hardy-Weinberg equation, Hardy-Weinberg principle, heterozygous,
homozygous, incompletely dominant, Punnett square
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. A bird’s feather color is controlled by two alleles, D
(dark feathers) and d (lighter feathers). Suppose
two Dd birds mate. What percentages of DD, Dd,
and dd offspring would you predict? Use the
Punnett square at right to help determine your
answer.
DD 25% Dd 50% dd 25%
D = d =
D = DD Dd
d = Dd dd
2. In this situation, identify the ratio of heterozygous (Dd) to homozygous (DD and dd) offspring you would
expect to find.
1:1 ratio of heterozygous (Dd) to homozygous (DD and dd).
Gizmo Warm-up
Many factors—immigration, natural selection, hunting, etc—can influence the
composition of a population. To determine if one of these factors is affecting a
population, it is useful to know what a population looks like when none of these
factors is present.
In 1908, Godfrey Hardy and Wilhelm Weinberg independently discovered the laws that govern such
populations. These laws can be explored in the Hardy-Weinberg Equilibrium Gizmo.
1. The parrots you see represent a population of 500 parrots. For these parrots, the D allele is incompletely
dominant over d, which means that Dd parrots are intermediate between DD and dd parrots. In the Gizmo,
select the TABLE tab. Identify how many parrots of each genotype are in the initial population.
DD 250 Dd 100 dd 150
2. Return to the DESCRIPTION tab. Click Begin, and then click Breed. Describe what happens.
The birds reproduced and layed eggs.
3. Click Hatch, and look on the TABLE tab. Identify the parrot populations now.
DD 181 Dd 239 dd 80
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