Law of Independent Assortment Mendel & Heredity Law of Independent Assortment

Law of Independent Assortment Genes for different traits on the same chromosome are inherited independently from each other Mendel discovered this through his experiments w/dihybrid crosses (2 parents w/2 different traits) Ex: tall, yellow pea plant with a short, green pea plant

Dihybrid cross – like a puzzle Can 2 parents with Heterozygous round, yellow seeds produce offspring with wrinkled, green seeds? 1st – determine possible gametes/ allele partners First Outside Inside Last Set up PSq boxes

Practice Dihybrid Cross Heterozygous Purple Flower & Homozygous Tall X Homozygous white flower & Heterozygous Tall Key: F purple flower T tall f white flower t short

Environment affects gene expression Internal - Age, gender (hormonal differences) Ex: male bird feathers colorful External - Temperature, nutrition, light, radiation, chemicals, viruses Ex: genes for height; without proper nutrition…will not be tall