Here is the correct flow chart: GENE > DNA > CHROMOSOMES > NUCLEUS. The cell nucleus contain chromosomes which are made from long DNA molecules. A gene is a short section of a DNA which codes for a specific protein.
Answer: The correct answer is- A) gene > DNA > chromosome > nucleus.
A gene can be described as segment of DNA ( deoxyribonucleic acid) that codes for specific protein, which inturn determines the trait/ characteristic of an individual.
Chromosomes are the threadlike structures that are composed of DNA and they are present within the nucleus of eukaryotic cells ( suh as plant and animal cell).
Thus, flow chart in option A) correctly shows the relationship between the cell structures that are listed.
DNA strand and its complementary strand are held together by hydrogen bonds. One strand will be bonded to a T (thymine) on the opposite strand by 2 hydrogen bonds.