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Punnet Squares Test
| Term | Definition |
|---|---|
| heredity | The passing of genetic material from parent to offspring |
| gene | The passing of genetic material from parent to offspring |
| allele | One of the alternative forms of a gene that governs a characteristic, such as hair color |
| genotype | The entire genetic makeup of an organism; also the combination of genes for one or more specific traits |
| phenotype | The entire genetic makeup of an organism; also the combination of genes for one or more specific traits |
| dominant | In genetics, describes an allele that is fully expressed whenever the allele is present in an individual |
| recessive | Describes an allele that will be masked unless the organism is homozygous for the trait |
| incomplete dominance | A condition in which two alleles are expressed such that the phenotype of a heterozygous individual is an intermediate of the phenotypes of the two homozygous parents |
| codominance | A condition in which two alleles are expressed such that the phenotype of a heterozygous individual is a combination of the phenotypes of the two homozygous parents |
| punnet square | A condition in which two alleles are expressed such that the phenotype of a heterozygous individual is a combination of the phenotypes of the two homozygous parents |
| probability | The likelihood that a possible future event will occur in any given instance of the event |
| ratio | A comparison of two numbers using division |
| pedigree | A diagram that shows the occurrence of a genetic trait in several generations of a family |
| Describe what Mendel discovered about genetic factors in pea plants | Gregor Mendel was an Austrian monk who studied pea plants. Mendel discovered that for each trait, the plants got one factor from each parent. Two recessive factors resulted in a recessive trait. One or two dominant factors resulted in a dominant trait. |
| Incomplete dominance with an example | When each allele in a heterozygous individual influences the phenotype. The result is a blend of the phenotypes of the parents Example: Red snapdragons crossed with white snapdragons will have pink offspring |
| Codominance with an example | Both of the alleles in a heterozygous individual will appear Example: Blood type |
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