Co-dominant allele Both phenotypes are dominant and the phenotype shows expression of BOTH alleles together Incomplete dominance Neither phenotype is dominant. The heterozygous individual expresses a “blend” of the traits. Multiple alleles More than two different alleles are possible in the population for a given trait. (i.e. Blood grouping)

Polygenic inheritance The pattern of inheritance where two or more genes control a trait that represents a range of outcomes PedigreeA chart which tells all of the known phenotypes for an organism, its ancestors, and its offspring CarrierAn unaffected heterozygous organism that can pass on a recessive allele for a disorder to its offspring

Gene therapyInserting working copies of a gene into someone with a non-working copy so the correct protein can be made. Transgenic organism An organism whose genetic material has been altered using genetic engineering techniques

Restriction Enzyme An enzyme that cuts double- stranded DNA Human Genome The sequencing of the approximately 40,000 genes on the 46 chromosomes