Question

which best describes the relationship between dna, genes, and chromosomes?
○ dna are segments of genes; the genes form tight coils called chromosomes.
○ genes are segments of dna; the dna forms tight coils called chromosomes.
○ chromosomes are segments of dna; the dna forms tight coils called genes.
○ genes are segments of chromosomes; the chromosomes form tight coils called dna.

Explanation:

To determine the correct relationship, recall the definitions: Genes are segments of DNA that code for proteins. DNA, along with proteins, is organized into tight coils called chromosomes.

• Option 1 is incorrect: DNA is not a segment of genes; genes are segments of DNA.
• Option 2 is correct: Genes are parts of DNA, and DNA (with proteins) coils to form chromosomes.
• Option 3 is incorrect: Chromosomes are not segments of DNA (chromosomes contain DNA and proteins), and DNA does not coil to form genes.
• Option 4 is incorrect: Genes are not segments of chromosomes (chromosomes contain DNA with genes), and chromosomes do not coil to form DNA.

Answer:

B. Genes are segments of DNA; the DNA forms tight coils called chromosomes.