Genetics Notes

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an observable characteristic

• trait

• gene

• allele

• DNA

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A segment of DNA that codes for a trait

• gene

• allele

• chromosome

• chromatid

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A version or variation of a gene

• trait

• gene

• allele

• DNA

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Dominant alleles are written with:

• Upper case always

• Lower case always

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Recessive alleles are written with:

• Upper case always

• Lower case always

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AA

• Genotype

• Phenotype

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Blue eyes

• Genotype

• Phenotype

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What is it called when the alleles in a genotype are different?

• Dominance

• Heterozygous

• Homozygous

• Recessiveness

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What is it called when both alleles in a genotype are the same?

• Dominance

• Heterozygous

• Homozygous

• Recessiveness