Which of these is characteristic of sleep apnea? a. sleep walking and sleep terrors b. involuntary movements of the arms and legs during sleep c. tendency to fall asleep suddenly during the day d. periods without breathing during sleeping?

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.