1. Agenda 4/10 Mild, medium, spicy warm up
Non-Mendelian patterns of inheritance notes
Non-Mendelian practice
Homework:
1. Advanced Genetics Video and Notes
2. Chp 15 Reading and Notes (Due Friday)

2. What are some human traits that do not follow normal dominant/recessive rules?

3. Co-dominance
Co-dominant traits occur when BOTH alleles for a trait are dominant
This means that BOTH traits will be expressed
Co-captain= both captains, co- dominance=BOTH dominant
Examples: Blood type AB, roan cattle, checkered chickens

4. Incomplete Dominance
Incomplete dominance occurs when neither allele is complete dominant
This results in the heterozygous genotype expressing a blending of traits
Example: Snapdragon flowers

5. Multiple Alleles
Multiple alleles refer to a trait that is coded for by more than two alleles
Example: Blood typing in humans
A allele, B allele, O allele
A and B are codominant
O is recessive

6. Polygenic Inheritance
Polygenic traits are traits controlled by more than one gene
Example: height, skin color, hair color
Polygenic traits typically follow a normal distribution curve

7. Epistasis
A gene in a different locus can affect the expression of a gene at another locus
‘Modifying genes’
Example: coat color in mice

8. X-Linked Traits
X-linked traits are traits that are coded for only on the X- chromosome
Men only have one x, so it is more likely that men will be affected by diseases carried on the X- chromosome
Women have a second X to ‘cancel out’ 1 damaged ex
Example: Hemophilia, color- blindness