A hockey puck sliding across the ice has . Energy

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.

Describe how alleles and genes are related

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine