This document summarizes different patterns of inheritance that do not follow Mendel's laws, including incomplete dominance, codominance, sex determination, and sex-linked traits. It provides examples for incomplete dominance where a cross between different phenotypes produces a third phenotype that is a blend of the parents. For codominance, both alleles contribute simultaneously to produce a third phenotype showing both parental traits together. It also describes sex determination by sex chromosomes and how traits on the X chromosome, like color blindness, are sex-linked and follow different inheritance patterns than traits on autosomes.

1. Non-Mendelian Genetics (Non-Mendelian Patterns of Inheritance) -Incomplete dominance -Codominance -Sex determination -Sex-linked traits Roel R. Maraya BEEdBSEd 4-1 (Natural Sciences) January 19, 2010

6. Example

9. Example R = allele for red flowers W = allele for white flowers red x white ---> pink RR x WW ---> 100% RW

12. Sex Determination

14. Genotypes and Phenotypes of Color Blindness in Humans Color-blind male 5. X c Y Normal male 4. XY Color-blind female 3. X c X c Normal female,carrier of the gene 2. XX c Normal female 1. XX Phenotypes Genotypes

15. Sex-linked trait