Patterns of inheritance How are most traits inherited? How do genes and the environment interact?

How are most traits inherited? Most traits are the result of complex patterns of inheritance Incomplete dominance Codominance Multiple alleles Polygenic inheritance

Incomplete Dominance Occurs when one allele is only partially dominant This has a phenotype of pink flowered offspring from red and white parents In both cases, both sets of alleles are written with two capital letters

Codominance Occurs when both alleles for a gene are expressed equally This phenotype is getting a chicken with both black and white feathers from a solid white hen, and a solid black rooster

Polygenic inheritance Occurs when more than one gene affects a trait This has many different phenotypes, like human height, or the time it takes a plant to flower

Genes and environmental factors Environmental factors can effect the way genes are expressed DNA strands zip and unzip to process certain chemicals ingested Epigenetics is the study of how environmental stimulus can change genetic traits