![]() ![]() What accounts for this specificity at all levels of reproduction? How does a fertilized egg “know” that it should develop into a kangaroo and not a koala? What makes stomach cells produce gastric acid, whereas pancreatic cells produce insulin? The blueprint for the reproduction and the maintenance of each organism is found in the nuclei of its cells, concentrated in elongated, threadlike structures called chromosomes. Furthermore, within each multicellular organism, every tissue is composed of cells specific to that tissue. From viruses to humans, each species reproduces after its own kind. ![]() ![]() Foxes have kits that grow up to be foxes. Dogs have puppies that grow up to be dogs.
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