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

Your answer would be the fourth one.

Here's why:

Chromosomes are what you'd find in the nucleus of a eukaryotic cell. Remember that eukaryotes have a nucleus, which defines them as such.

In the nucleus chromosomes are in a relaxed state called chromatin. The chromatin forms into those tight coils of DNA which we call chromosomes. Each chromosomes has a multitude of genes on them. These genes are responsible for hair color and skin pigment, or genetic diseases in your body, the list goes on.

The image I provided should help explain visually.

I hope this helps! If you have any questions let me know!

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature