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.
Every one has two alleles for any genetic trait. In reproduction cells, such as eggs and sperm, there is only one allele for any trait. When the sperm and egg combine, y â¦ ou get two alleles. Essentially, it's to allow for genetic mingling and evolution.