Module 6
1. Module 6
1.28. Lesson 6
Module 6—Mendelian Genetics: The Transmission of Traits to the Next Generation
Lesson 6—Chromosomal Theory and Sex-linked Inheritance
Get Focused
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Genetics, it seems, does not always play equally with each gender. Have you ever noticed that there are quite a few more balding men than balding women? Perhaps you know of someone who is colour-blind. If you do, it is far more likely that the person you know is male instead of female. Each of these examples indicates that there is more going on than independent assortment. There appears to be a link between the appearance of certain traits and gender.
In this lesson, you will begin to explore inheritance patterns that do not follow all of Mendel’s laws of inheritance. You will see how some traits occur more frequently in one gender than the other, and are said to be sex-linked.
In this lesson, the following focusing questions will be examined:
- Why do some traits appear more frequently in one gender than the other?
- How did Thomas Hunt Morgan’s work create experimental support for the chromosomal theory of inheritance?
sex-linked: a trait that is found in one gender more than another; contrary to autosomal traits that are found equally in both genders
chromosomal theory of inheritance: the theory that chromosomes are strings of genes and that each gene has a specific location on a specific chromosome
Module 6: Lesson 6 Assignment
Your teacher-marked Module 6: Lesson 6 Assignment requires you to submit a response to the following:
- a lab on sex-linked traits in Drosophila
Your work from this lab will be added to your assignment for assessment. Download a copy of the Module 6: Lesson 6 Assignment to your computer now. You will receive further instructions on how to complete this assignment later in the lesson.
Remember to add new terms and concepts to your flash cards as you work through this lesson.
You must decide what to do with the questions that are not marked by the teacher.
Remember that these questions provide you with the practice and feedback that you need to successfully complete this course. You should record the answers to all of the questions and place those answers in your course folder.
Remember, you also have the option of trying additional questions from the textbook for further practice. Consult with your teacher for the answers to these questions. The Key will also provide you with many Diploma Exam-style multiple-choice, numerical-response, and written-response questions that will be an excellent review of the module. Practising your responses to these types of questions is good preparation for the Diploma Exam.