Learning Objectives

1. Describe how an understanding of chromosomes helps to account for events that compose mitosis and meiosis.
2. Name some ordinary and extraordinary chromosomal events that can create new phenotypes (outward appearances).
3. Know how fruit fly experiments have helped us understand chromosomal behavior.
4. Understand how changes in chromosome structure and number can affect the outward appearance of organisms.
5. Distinguish autosomal recessive inheritancefrom sex-linked recessive inheritance.
6. Give examples of each of the above types of inheritance.
7. Explain how changes in chromosomal number can occur and present an example of such a change.
8. List examples of phenotypic defects and describe how each can be treated.
9. Explain how knowing about modern methods of genetic screening can minimize potentially tragic events.