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What is the basis for the delay between the atrial and ventricular contractions in a normal heart?
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Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.
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As a small change in a person's dna can cause a genetic disorder
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What is the basis for the delay between the atrial and ventricular contractions in a normal heart?...
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