The unit of inheritance that is passed from parent to offspring is called a gene.

Here's why:

* Genes are segments of DNA: They contain the instructions for building and maintaining an organism.

* Genes are located on chromosomes: Chromosomes are structures within the nucleus of cells that carry the genetic material (DNA).

* Each parent contributes one chromosome from each pair to their offspring: This means that offspring inherit one copy of each gene from their mother and one copy from their father.

* These genes influence traits: They determine everything from hair color and eye color to height and susceptibility to certain diseases.

Let me know if you have more questions about inheritance!