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Download Genetic Vocabulary - Renton School District
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Transcript
Essential Vocab • Genotype – the symbolized form; gene forumula (ex: BB) • Phenotype – physical appearance/description (ex: brown) • Homozygous – 2 genes that are the same (ex: BB or bb) ; Pure Bred • Heterozygous – 2 genes that are different (ex: Bb) ; Hybrid • Dominant – the stronger gene; appears in the phenotype if present • Recessive – the weaker gene; appears in the phenotype only when homozygous Genetic Vocabulary • Phenotype: the actual appearance of trait as it is expressed—what you see • Example: blue eyes • Genotype: term given to the genes on the chromosomes, which genes are present on chromosomes • Example: Pp or Xx • Dominance: term given to gene that is expressed phenotypically, no matter what the genotypic make-up; if this gene is present the trait will be seen • Recessive: term given to gene that is only expressed phenotypically if the offspring carries both genes—in other words, received a recessive gene from both parents • Homozygous: When genes are the same, both dominant or both recessive; will be visibly seen as either dominant or recessive trait • Heterozygous: When genes are different, offspring has one dominant and one recessive gene; phenotypically, the offspring will express (show) the dominant gene • Incomplete Dominance: A mixture of genetic material; EX: Red flowers crossed with White flowers make pink flowers
