Chapter 9 Heredity
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18 terms
Terms | Definitions |
|---|---|
 trait | a characteristic that an organism can pass on to its offspring |
| heredity | a set of traits an organism recieves from its parents |
| genetics | the study of heredity |
| true-breeding plant | a plant that will always produce offspring with the same form of a trait when it self-pollinates |
| cross-pollination | when the pollen from one plant is used to fertilize another plant |
| gene | a unit that determines traits |
| alleles | different forms of a gene |
| dominant allele | the form of a gene that, when present, covers up the appearance of the recessive allele |
| recessive allele | the form of a gene that is hidden when the dominant allele is present |
| phenotype | the form of a trait that an organism displays |
| genotype | the alleles of a gene an organism contains |
| punnett square | shows all the possible combinations of the alleles from the parents |
| probability | the mathematical chance that an event will occur |
| incomplete dominance | when the phenotype of the alleles blend |
| codominance | when an organism that has both alleles of a gene displays both phenotypes at the same time |
| polygenic traits | traits that are determined by more than one gene |
| heterozygous | having two different alleles for a trait |
| homozygous | having two identical alleles for a trait |
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