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: Genes are specific segments of DNA that code for proteins. DNA, along with proteins, is tightly coiled and packaged into structures called chromosomes.

• First option: Incorrect, as genes are segments of DNA (not vice versa).
• Second option: Correct, as genes are DNA segments and DNA coils to form chromosomes.
• Third option: Incorrect, chromosomes are made of DNA (not segments of DNA in this reversed way, and DNA does not coil into genes).
• Fourth option: Incorrect, chromosomes contain DNA (not form DNA via coiling, and genes are DNA segments, not chromosome segments in this misrepresented way).

Answer:

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