Education Technology

# Activities

• ##### Subject Area

• Science: Biology: Genetics

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™
• ##### Software

TI Connect™
TI-GRAPH LINK™

• ##### Accessories

TI Connectivity Cable
Unit-to-Unit link cables

• ##### Other Materials
This is Activity 4 from the EXPLORATIONS Book:
Data Collection Activities for the Middle Grades with the TI-73, CBL™, and CBR™

## Hello Dolly

#### Activity Overview

Students will draw a model of a Punnett Square on the calculator and discover all possible combinations of Genotypes. They explore theoretical and experimental probabilities. They also collect data through experimental probability and use the laws of heredity.

#### Before the Activity

• Install the TI Connect™ or TI-GRAPH LINK™ software on the calculator using the TI Connectivity cable and the unit-to-unit link cable
• See the attached PDF file for detailed instructions for this activity
• Print pages 51 - 58 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to your class.

Follow the Activity procedures:

• Draw four 2 by 2 Punnett Squares on the calculator, including a pure dominant, a pure recessive, a pure hybrid, and a
• Label the models and save the drawings
• Use the coin-toss function to simulate the birth of 40 offsprings to a pair of pure hybrid parents
• Record this data and the frequencies on the Data Sheet
• Generate a circle graph to compare the probabilities of each gene combination and turn in the data by creating lists
• Plot the graph of genotype distribution
• Compare experimental probability with theoritical probability
• #### After the Activity

Students will fill in the Data Collection and Analysis Sheet and answer the questions listed on it.

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary