__ store DNA and are formed when DNA tightly wraps around a protein. Phenotypes Chromosomes Genes Genotypes

## Step 1<br />The question is asking about the structure that stores DNA and is formed when DNA tightly wraps around a protein. The options provided are Phenotypes, Chromosomes, Genes, and Genotypes.<br /><br />## Step 2<br />Let's analyze each option:<br />- Phenotypes refer to the observable characteristics or traits of an organism, such as its physical appearance, behavior, and other attributes. These are determined by the organism's genetic makeup and the environment.<br />- Chromosomes are structures within cells that contain a person's genes. They are made of DNA tightly coiled around proteins called histones. This structure allows the DNA to be compacted and stored efficiently within the cell nucleus.<br />- Genes are segments of DNA that code for specific proteins or functions. They are the basic units of heredity and are located on chromosomes.<br />- Genotypes refer to the genetic makeup of an organism, specifically the set of genes it carries.<br /><br />## Step 3<br />Based on the above analysis, the correct answer is Chromosomes, as they are the structures that store DNA and are formed when DNA tightly wraps around a protein.