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15 Cards in this Set
- Front
- Back
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Trait
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characteristics of an organism that can be studied in genetics
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Genetics
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study of how traits are passed from parents to offspring
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Dominant Trait
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the trait that showed up in Mendels F1 generation
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Recessive Trait
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the trait that was not seen in the F1 generation
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Gene
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a unit of heredity, DNA code for a trait
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Alleles
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different versions of genes. (ex: tall and short in plants)
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Homozygous
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having two of the same alleles for a gene (ex: TT or tt)
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Heterozygous
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having two different alleles for a gene (ex: Tt or Pp)
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Probability
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the chance that an event may or may not take place (1/4 or 25%)
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Phenotype
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the physical appearance of a trait (ex: purple flowers, tall plants, wrinkled peas)
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Genotype
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the alleles that an organism has for that trait (ex: PP or pp)
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P1, F1, & F2
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symbols for the generations of Mendel's peas: parental, 1st offspring generartion, 2nd offspring generation.
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Testcross
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when an individual of unknown genotype is crossed w/ a homozygous recessive individual.
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Incomplete Dominance
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the heterozygous genotype results in a phenotype intermediate between the dominant and recessive trait
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Codominance
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when both alleles show up in the heterozygous individual
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