1 / 11

Class Topics

Hand in Interpreting Information in a Pedigree W.S. before the bell rings please (not 3A) Chapter 8 – Beyond Mendel Sex-linked inheritance Pedigree lab "Attitude is a little thing that can make all the difference." Sir Winston Churchill.

patelj
Télécharger la présentation

Class Topics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hand in Interpreting Information in a Pedigree W.S. before the bell rings please (not 3A) Chapter 8 – Beyond Mendel Sex-linked inheritance Pedigree lab "Attitude is a little thing that can make all the difference." Sir Winston Churchill To review learning pedigree and try our hand a sex-linked pedigree analysis. Title: Biology 2/8/07 Class Topics Objectives: Wednesday, January 1, 20209:14 PM

  2. Class Assignments What By When • Read 177-182 2/8/07 • W.S. Interpreting Information in a Pedigree 2/8/07 • Not 3A • Lab – A Human Pedigree 2/8/07 • W.S. Interpreting Information in a Pedigree (3A) 2/12/07 • W.S. 8.2 (DR/Color Blind/Gene Spy) 2/12/07 • Due this class period • Due next class period • Due in the future

  3. Grade Sheet 2A – p. 157 (5 pts.)

  4. Sex-linked inheritance • Some genes are carried on the X chromosome - Sex-linked genes • Fruit flies example • White eyed male with red eyed female = all red eyed offspring • Crossed two of the F1 offspring and ended up with 3:1 ratio - red to white (all white eyed flies were male!!!)

  5. Sex-linked inheritance • Found mostly in males • Males are hemizygous • Cannot hide recessive allele • Cannot be carriers of trait • Females can show trait • Must be homozygous recessive • Can carry trait (heterozygous) • Has nothing to do with hormones • Sex-influenced traits

  6. X-linked Traits(Human) • Hemophilia • Queen Victoria (1819-1901), clotting factors • Red-Green colorblindness • Duchenne Muscular Dystrophy • affects children 3-6 years old • defective protein causes muscles to weaken

  7. Lab - A Human Pedigree • Work in partners (one sheet, two names) • Older answers odd questions • Younger answers even questions • Turn in when done! • Pick up and work on (by yourself) • W.S. 8.2 (DR/Color Blind/Gene Spy)

  8. Sex-linked Punnett Squares • X X x X Y • Cross a hemophiliac carrier with a person without hemophilia X X X Y

  9. Sex-linked questions • What do you know about the parents of a colorblind girl? • What do you know about the father of a hemophilia carrier Sex-linked Inheritance Hemophilia Pedigree Colorblindness

More Related