Asound that's produced by a single wave at a constant frequency and with no overtones is called
a. a pure sound.
b. a mellow sound.
c. an average sound.
d. a discordant sound.

Which of the following choices is not an effective solution to the energy waste related to inefficient lighting? a. using low-pressure sodium lighting sources b. pointing lights on billboards and street signs upward c. placing light sources on time controls d. shielding light to direct it downward

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.

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.