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.
W â¦ hen an egg cell is produced, whether it receives the mother's or father's copy of any given chromosome is determined randomly. This alone gives over 8 million possible combinations. Then the chromosomes swap pieces before dividing, randomizing the DNA even more. So no two egg cells have the exact same DNA. And this is just for the egg cells in one person.