This diagram shows how loud certain frequencies must be in
order for people of different ages to hear them. the needed
intensity is called the "hearing level."
according to the graph, what is the maximum age at which a
4000 hz sound wave with an intensity of 20 db would be
heard?
hearing level (db)
55
60
65
70
500 hz
2000 hz
3,000 hz
4,000 hz
6,000 hz
70
20
30
60
40 50
age (years)
age (years)

Suppose a point mutation, such as a change from an adenine to a guanine, occurs in the genome of a human sperm cell. the mutation could occur in any region of a gene. the effect of the mutation on the phenotype of the offspring will be determined by where the mutation occurs and its effect on the final gene product. in which of the following scenarios could the mutation alter the phenotype of the offspring? select all of the scenarios that apply the mutation occurs in the promoter and affects the rate of gene transcription. the mutation results in a new, dominant allele the mutation occurs in a portion of an intron not responsible for exon splicing the mutation occurs in a gene that controls development and alters differentiation of a cell type during development. the mutation occurs in a codon and alters the function of the final protein e mutation occurs in a codon, and the amino acid sequence of the final protein is unchanged.