What is the one of the tiny threadlike DNA-containing bodies found in the cell nuclei of all plants and animals responsible for transmitting hereditary characteristics?

The tiny threadlike DNA-containing bodies found in the cell nuclei of all plants and animals are called chromosomes. They are responsible for transmitting hereditary characteristics through the genetic information they carry. Each chromosome is made up of DNA tightly coiled around proteins, allowing for efficient packaging and regulation of genetic material during cell division.