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Laboratory 8: Population Genetics and Evolution

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Biology 11 Pre-AP Lab Report

Laboratory 8: Population Genetics And Evolution

Block 6

BACKGROUND INFORMATION

The Hardy-Weinberg theory suggests that evolution occurs through changes in frequencies in alleles. The reason for this lab is to find what effect altering the environment has on the equilibrium. In the lab, P is the representation of the dominant trait, and q is the representation of the recessive one. The formula of the Hardy-Weinberg equilibrium is p2+2pq+q2=1. There are also five conditions which need to be met in order to satisfy this equilibrium:

The mating is random

There is no natural selection

No presence of gene flow

No mutation of alleles allowed

The breeding population is sufficiently large

PURPOSE OF EXPERIMENTS

The objective of the lab is to gain a better understanding of how the Hardy-Weinberg equilibrium works and how natural selection affects allele frequencies in populations. We also study the relationship between evolution and changes in allele frequency.

MATERIALS & PROCEDURES

Refer to Laboratory 8-Population Genetics And Evolution .

DATA

Part 8A:

Phenotypes

Tasters

(p2+2pq)

Non-Tasters

(q2)

Frequency of Alleles (%)

Class Data

Count

% of total

Count

% of total

p

q

22

81.5

5

18.5

0.57

0.43

Part 8B:

Generation

A/A

A/a

a/a

1

2

17

7

2

14

10

3

3

3

12

11

4

4

12

10

5

5

10

11

Part 8C:

Generation

A/A

A/a

a/a

1

10

16

0

2

13

13

0

3

12

14

0

4

13

13

0

5

18

8

0

Part 8D:

Generation

A/A

A/a

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