1. OBJ: Given notes, video, activity sheet SWBAT describe some patterns of human inheritance including multiple alleles, many gene traits, and sex-linked genes with 70% accuracy BRING IN TEXT BOOK DN: Hand-in SVQ4 quiz scantron; HW Check- DNA Connection Booklet ACT: Introduction to multiple alleles, many gene trait, sex chromosomes, sex-linked genes, colorblindness Read, Text p ; Work on Human Inheritance Booklet HW: Complete Human Inheritance Booklet; UPCO10 Quiz (Ch.6; Mitosis, Meiosis, Sexual, Asexual Repro) next week; Work on Genetics Review Sheets; Genetics Exam, Monday April 28

2. Two allele system (Mendel)
T = tallness; t = shortness
Three allele system
(multiple allele)
IA = A blood
IB = B blood
i = O blood (recessive) T T T t IB i IB IA IA IA t t i IB IB i IA i

3. Human Inheritance Notes
Multiple Alleles
Ex: Human Blood Types
Alleles: IA, IB, i
Human Blood Type
Allele Combination A
IAIA or IAi B
IBIB or IBi
AB (universal receiver)
IAIB
O (universal donor) ii

4. Trait One Gene Trait (Mendel) finger length gene 50% Dad 50% Mom
1 allele
gene
1 allele

5. Trait Many Gene Trait Ex: Human Height = 4 genes
Human skin color, human eye color
50% Dad
50%
Mom
Trait
Human Height
4 allele
many
genes
4 allele

6. Body Cell contains 46 chromosomes or
23 pairs of chromosomes
Sex chromosome = 23rd chromosome pair
Sex chromosome determines:
1] male/female
2] normal vs. red-green colorblind vision
3] other traits (sex-linked)

7. Father X Y X XX XY Mother Human Sex Chromosome (chromosome pair 23)
daughter
son
daughter
son

8. Sex-Linked Genes: genes carried on sex chromosomes; example red-green colorblindnessY
XCXC
XCY Xc
XCXc
XcY
Female: XX Male: XY
C = normal vision
c = colorblindness
father
daughter normal
son normal
mother (carrier)
Son colorblind
daughter carrier
Carrier: a person who does not show the observable trait but is carrying the hidden recessive allele on the sex chromosome.