A decrease in blood Na levels stimulates the release of aldosterone from the adrenal cortex. This is an example of control.

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

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Which diagram best represents the chromosomes that would be found in a two new skin cells produced as a result of this process?