2. History of the Munchkin First noted in 1940’s during London Blitz Cat reappears in Stalingrad in 1953 Pregnant cat found in Rayville LA in 1983

3. Munchkin Genetics Short bone structure in legs caused by a dominant allele What is the risk of breeding munchkin cats of unknown genotype?

4. How Is Heterozygosity A Problem In The Domestication of Animals?

5. Puggles & Labradoodles

6. Dihybridization The probability of inheriting two traits may be determined using a 16 box Punnett square. Each parent makes 4 possible gamete combinations from the two homologous pairs associated with the traits As before, gametes must contain only one chromosome from each homologous pair Homologous pairs are reunited in the 16 possible zygotes

7. Independent Assortment and Formation of Gametes

9. Phenotypic Ratios Phenotypic: Dom1Dom2: Dom1Rec2: Rec1Dom2: Rec1Rec2

10. Genotypic Outcomes

11. Sample Dihybridization Assume that the trait of smooth peas is dominant (S) relative to the trait of wrinkled peas (s) Assume that the trait of yellow peas (Y) is dominant to the trait of green (y) What proportion of the offspring from the cross of two true dihybrid parents (heterozygous for both traits) will belong to each of the four phenotypic categories?