1. "Attitude is a little thing that can make all the difference."
9/3/2019
Title: Biology 2/9/07
Objectives:
To assess learning about some of the aberrations to Mendelian genetics and dihybrid crosses and continue to learn about pedigree analysis
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
Tuesday, September 03, :57 PM

2. Class Assignments Read 177-182 2/9/07
9/3/2019
Class Assignments
What
By When
Read /9/07
W.S. Interpreting Information in a Pedigree 2/9/07
Lab – A Human Pedigree 2/9/07
W.S. 8.2 (DR/Color Blind/Gene Spy) 2/13/07
Due this class period
Due next class period
Due in the future

3. 9/3/2019
Grade Sheet
2A – p. 157 (5 pts.)

4. Sex-linked inheritance
9/3/2019
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!!!)
Sex-linked inheritance

5. Sex-linked inheritance
9/3/2019
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)
9/3/2019
Hemophilia
Queen Victoria ( ), clotting factors
Red-Green colorblindness
Duchenne Muscular Dystrophy
affects children 3-6 years old
defective protein causes muscles to weaken
X-linked Traits (Human)

7. 9/3/2019

8. 9/3/2019

9. Lab - A Human Pedigree Work in partners (one sheet, two names)
9/3/2019
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)

10. Sex-linked Punnett Squares
9/3/2019
X X x X Y
Cross a hemophiliac carrier with a person without hemophilia
Sex-linked Punnett Squares
X X X Y

11. Sex-linked Inheritance
9/3/2019
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