Passing of traits from parents to offspring

Different forms of the same gene

physical characteristics of an organism

an organism's genetic makeup; or allele combinations

an allele that is always expressed

an allele that is only expressed when there are no dominant alleles present

threadlike structures made of DNA molecules that contain the genes

a long molecule containing the genetic information that makes up the chromosomes

an organism that has two different alleles for a trait

an organism that has two identical alleles for a trait

any change in an organism's DNA

an if...then...because statement that predicts how two variables are related to each other