PLEASE HELP I REALLY DONT UNDERSTAND PLEASE IM IN A TEST I NEED HELP ASAP

They said i have got a sign of tuberculosis what should i do

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.

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.