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.
While there are many possible genotypes for our offspring, there are only 4 possible phenotypes. The phenotypic ratio, or relative numbers of offspring with each phenotype, for a dihybrid cross is always the same: 9:3:3:1.