Module 6 Mendelian Genetics

Lesson 4—Dihybrid Crosses

Get Focused

Working with one gene at a time is a lot like playing catch. It takes a few tosses in the back yard with mom, dad or an older sibling, but after a bit of practice, it becomes second nature. Working with two or more genes is more like juggling. The basic concepts are all the same. All of the inheritance types we have covered still apply, only now you will need to keep your eye on two genes, each with their own alleles. The total movement is trickier, and the process might take a bit more practice.

In this lesson, you will learn how to follow the inheritance of two separate traits at the same time. As you follow two traits at once, you will understand how the movement of alleles for one trait does not effect the movement of alleles for the other trait during the formation of gametes.

In this lesson, the following focusing question will be examined:

• How do scientists track the inheritance of more than one trait at a time?

This lesson will take approximately 100 minutes to complete.

Module 6: Lesson 4 Assignment

You will complete a lab on mouse genetics (two traits) for assessment.

Once you have completed the learning activities in the lesson you can complete the online assignment.

Bio30 3.6.4 online assignment

The other questions and activities in this lesson are not marked by the teacher; however, you should still attempt all of the work offered here. They are designed to help you review important information and build key concepts that may be applied in future lessons.

Here is a tutorial video for this lesson that you can watch if it suits your learning style.  Bio30 tut#3.6.4 Dihybrid Probability.