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Genetics Vocabulary
| Term | Definition |
|---|---|
| the passing of traits from parents to offspring | heredity |
| the study of heredity | genetics |
| a trait controlled by one's DNA; passed down from a previous generation | inherited trait |
| a trait that one gains after birth due to an external influence or experience; not passed down from a previous generation | acquired trait |
| deoxyribonucleic acid; it controls all the activities of the cell | DNA |
| segment of DNA that carries hereditary instructions and are passed from parent to offspring | gene |
| a coiled structure of DNA in the cell's nucleus | chromosome |
| the chromosomes that carry genes that determine the sex of the offspring | sex chromosome |
| different forms of a single gene | allele |
| the trait observed when at least one dominant allele for a characteristic is inherited | dominant trait |
| the trait observed only when two recessive alleles for the same characteristic are inherited | recessive trait |
| an organism's inherited combination of alleles | genotype |
| an organism's inherited appearance | phenotype |
| a genotype with one dominant and one recessive allele | heterozygous |
| a genotype with two identical alleles | homozygous |
| a tool used to visualize all the possible combinations of alleles from parents | Punnett square |
| a diagram of family history used for tracing a trait through several generations | pedigree |