Lava that cools so quickly that ions do not have time to arrange themselves into crystals will form igneous rocks with a texture. a.)porphyritic b.)glassy c.)coarse-grained d.)fine-grained

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.