1. Warm Up: Give an example of a heterozygous genotype Flush: What is your favorite holiday to celebrate?
Homework: None- but come see me tomorrow morning if you are struggling with Punnett square problems!

2. Punnett Square Review Questions
Work on these as a group
Once I see that every group is finished, we will go over the answers.

3. Complex Patterns of Inheritance
Many traits do not follow simple dominant/recessive rules
For example, height in humans
There are not just two options for heights
Today we will review some of those exceptions

4. Incomplete Dominance
Description: Neither trait is completely dominant, so the heterozygous genotype is a blending of traits
Examples: Snapdragon flower color, rabbit coat color

5. Co-dominance
Description: BOTH traits are dominant so in the heterozygous genotype both traits are seen
Examples: AB blood type, Chicken feather colors, Roan cattle colors

6. Multiple-Alleles
Description: Traits that are controlled by more than just two alleles
More than just a recessive and dominant allele
Examples: ABO blood types in humans

7. Human Blood Types

8. Sex-linked traits
Description: genes that are carried only on the X- chromosome. This means men are much more likely to get diseases carried on the X- chromosome since they only get one copy.
Examples: color-blindness, hemophilia

9. Practice Problem
Hemophilia is a sex-linked trait. If a mother that is heterozygous for hemophilia (carrier), mates with a normal male, what is the chance that their children will have hemophilia? What is the chance that their sons would have hemophilia? Draw a Punnett Square: