Genetics Vocab

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Gene: sequence of DNA coding for a protein, determining a trait; passed from parent to offspring.

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sequence of DNA that codes for a protein and thus determines a trait; factor that is passed from parent to offspring

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Allele

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One of several forms of a gene.

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Genotype

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genetic makeup of an organism

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Phenotype

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Physical characteristics of an organism.

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Homozygous

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having two identical alleles for a particular gene

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Heterozygous

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having two different alleles for a particular gene

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Dominant Allele

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The allele expressed in a heterozygote

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Recessive Allele

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The allele not expressed in a heterozygote.

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Pedigree

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Chart showing presence/absence of a trait across family generations.

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Polygenic Trait

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trait controlled by two or more genes