The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.
Within DNA, a variety of a particular gene is called a(n):
allele |
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heterozygous |
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homozygous |
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chromosome |