Date Dec 11 2014 Page Table of Contents

Date: Dec 11, 2014 Page: Table of Contents p. 1 W. O. D: Last 5 pages Warm-ups: Front Cover W. O. D. : Sex-linked (X-linked) trait - a gene that is found only on the X chromosome and not the Y chromosome. Question: Can you think of a trait that only occurs in males? Please remind me in the last 10 minutes of class to organize notebooks.

X-Linked, or Sex-Linked Traits <- Hemophilia ->

Non-disjunction • Meiosis • Nondisjunction

Syndromes live: • • Edward’s syndrome Klinefelter’s Syndrome Turner’s Syndrome Down Syndrome

What would you do? You were just told you are going to be a parent. On the first visit to the doctor, they ask you if you would like routine genetic screening, to let you know if your child has chromosomal disorder. Would you have the screening done? Explain why or why not. Now the doctor says your tests came back positive for chromosomal disorder. Choose a disorder for your child to have. How will you prepare for the changes in this child’s future based on their condition?

Lab questions: 1. What condition is exhibited by Metaphase Plate 1, and why? 2. What condition is exhibited by Metaphase Plate 2, and why? 3. What condition is exhibited by Metaphase Plate 3, and why? 4. Do your answers agree with your classmates? 5. In what ways do your answers disagree? 6. What are some of the problems that you had in working with the metaphase plates?

Reflection: Give an example of an X-linked, or sex-linked trait.