immune system, n the group of organs, cells, and chemicals that protect the body from harmful viruses, bacteria, and abnormal cells. It includes bone marrow, proteins, the thymus, the spleen, the lymphocytes, and other white blood cells.
50% from each parent: one allele in each gene, each parent, for a total of two. 2 people found this useful. Edit. Share to: 1  College Admission Interview Dos and Don'ts Some colleges offer applicants the opportunity to interview on campus or close to home.
Parents pass genes to their offspring that program cells to make specific enzymes and other proteins whose cumulative action produces and individual's inherited traits. In the absence of mutation, asexually reproducing organisms produce offspring that are genetically identical to each other and to their parents.