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the passing of traits from parents to offspring


a characteristic that an organism can pass on to its offspring through its genes


the scientific study of heredity


the process in which an egg cell and a sperm cell join to form a new organism


the offspring of many generations that have the same traits


the set of information that controls a trait; a segment of DNA on a chromosome that codes for a specific trait


the different forms of a gene

dominant allele

an allele whose trait always shows up in the organism when the allele is present

recessive allele

an allele that is masked when a dominant allele is present


an organism that has two different alleles for a trait


a number that describes how likely it is that an event will occur

Punnett square

a chart that shows all the possible combinations of alleles that can result from a genetic cross


an organism's physical appearance or visible traits


an organism's genetic makeup or allele combinations


having two identical alleles for a trait


having two different alleles for a trait


a condition in which neither of two alleles of a gene is dominant or recessive

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