Back to learning exercises hit list
Search all MERLOT
Click here to go to your profile
Select to go to your workspace
Click here to go to your Dashboard Report
Click here to go to your Content Builder
Click here to log out
Search Terms
Enter username
Enter password
Please give at least one keyword of at least three characters for the search to work with. The more keywords you give, the better the search will work for you.
select OK to launch help window
cancel help

MERLOT II


    

Learning Exercise


Material: Virtual Courseware - Drosophila
Submitted by: Trinity Wedgworth on Mar 31, 2009
Date Last Modified: Apr 28, 2009
Title: Monohybrid Cross - Drosophila Online Lab
Description: This lesson accompanies the use of the virtual courseware Drosophila online lab activity. This lesson was created as a part of a webinar for the Drosophila and Natural Selection virtual courseware applications.
Type of Task: Individual, Student-centered, Supervised
Time Required 40 minutes
Topics: Genetics, Monohybrid Cross
Course: Life Science
Audience: Middle School
Categories:
Prerequisites Skills: Students must be able to calculate ratios (6th Grade Math Content Standard). Students will need to know examples of different traits found in humans (eye color, hair color, skin color, etc.)
Learning Objectives: Students will be able to define the following terms: genotype, phenotype, monohybrid, dominant, and recessive. Students will predict the phenotypic and genotypic ratios for a monohybrid cross in the F1 and F2 generations.
Technical Notes: Students will require access to a computer so they can use the virtual courseware activity. Teacher must demonstrate how to perform crosses before allowing the students to perform their own cross.
Text of Learning Exercise: 1. Start defining scienctific vocabulary for students based on discussion. Dominant traitsÂ….are there more people with dark hair or light colored hair in the classroom? Traits that are seen more often are called dominant. Traits that are seen in smaller amounts within a population are considered recessive. 2. Introduce Drosophila to the class. Explain that there are many different types of alleles in Drosophila. Show students a list of different alleles present in Drosophila and what these traits look like when they are expressed. 3. Ask students to remember back to sixth grade when they learned about probability. Ask students what they remember about calculating probabilities and ratios. Explain that we use probabilities and ratios when learning about genetics to make predictions about the types of traits we will see in offspring. 4. Show a Punnett square. Demonstrate that in order to calculate probability of traits, scientists use punnett squares. Demonstrate how to use a Punnett square to do a monohybrid cross. As a class, work through a few more punnett square examples. 5. Demonstrate how to perform a monohybrid cross using the Drosophila online lab. Show students all the necessary steps for performing this genetic cross. Have them copy this information into their science/lab journals. 6. Teacher will assign students to a computer. If there are fewer computers than students, teacher will allow students to work with a partner to complete this lab.
Bookmark and Share