Eduqas Biology A Level C2 - Inheritance

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8 Terms

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Define gene

A sequence of DNA that codes for a polypeptide and which occupies a specific locus on a chromosome

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Define locus

Location of a gene on a chromosome

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Define allele

A variant nucleotide sequence for a particular gene at a given locus, which codes for an altered phenotype

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What does it mean when someone is homozygous for a gene?

They have two of the same allele for that gene

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What does it mean when someone is heterozygous for a gene?

They have two different alleles for that gene

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What is a dominant allele?

An allele that is always expressed if present

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What is a recessive allele?

An allele that only expressed when it is homozygous

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What is monohybrid inheritance?

The inheritance of a single gene