In Graves' disease, the immune system makes antibodies that stimulate TSH receptors on the thyroid gland. What effect does this have on Krista's thyroid

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.