Answer;
-Gene
A specific stretch of DNA that programs the amino acid sequence of a polypeptide is a gene.
Step-by-step explanation;
-Genes are a section of DNA that are in charge of different functions like making proteins.Genes are responsible for all aspects of life. Long strands of DNA with lots of genes make up chromosomes. DNA molecules are found in chromosomes.
-Each gene occupies a specific position on a chromosome. Because genes provide instructions for making proteins, and proteins determine the structure and function of each cell in the body, it follows that genes are responsible for all the characteristics you inherit.