7th grade genetics #15388
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| heredity | the passing of traits from parents to offspring |
| gene | a factor that controls a trait |
| trait | a characteristic that an organism passes on to its offspring. (color of hair, eye color) |
| mutation | a change of chromosome |
| hybrid | two different alleles for a trait (Aa, Tt, Bb) |
| Punnett square | a chart that shows possible gene combinations |
| dominant | a trait that shows up on an organism |
| recessive | an allele that is covered up when a dominant allele is present. (Aa, Dd, Bb) recessive alleles-lower case letters |
| probability | the likelihood that an event will occur |
| purebred | 2 of the same alleles for a trait (TT, BB, AA) |
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