Genetics Vocabulary

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Heterozygous

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Having two different alleles for a particular gene. (Bb)

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Homozygous

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Having two identical (SAME) alleles for a particular gene. (BB or bb)

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Hybrid

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An organism that has two different alleles for a trait; another term for heterozygous.

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Purebred

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An organism that has identical alleles for a trait; another term for homozygous.

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Genotype

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The genetic makeup of an organism; the combination of alleles. (letters)

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Phenotype

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The physical appearance or visible traits of an organism. (Looks)

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Dominant Allele

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An allele that expresses its phenotype even in the presence of a recessive allele. Represented by a Capital letter, and capitals always win! (BB or Bb)

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Recessive Allele

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An allele that is hidden when a dominant allele is present. Represented by a Lower case letter. (bb)