- Cortical inheritance
Cortical Inheritance or structural inheritance was discovered by Tracy Sonneborn, and other researchers, during his study on protozoa in the late 1930s. Sonneborn demonstrated during his research on Paramecium that the structure of the cortex was not dependent on genes, or the liquid cytoplasm, but in the cortical structure of the surface of the ciliates. Preexisting cell surface structures provided a template that was passed on for many generations.
John R. Preer, Jr., following up on Sonneborn's work, says, "The arrangement of surface structures is inherited, but how is not known, Macronuclei pass on many of their characteristics to new macronuclei, by an unknown and mysterious mechanism."
Other researchers have come to the conclusion that "the phenomena of cortical inheritance (and related nongenic, epigenetic processes) remind us that the fundamental reproductive unit of life is not a nucleic acid molecule, but the remarkably versatile, intact, living cell."
An article in Newsweek mentions research that shows that "Some water fleas sport a spiny helmet that deters predators; others, with identical DNA sequences, have bare heads. What differs between the two is not their genes but their mothers' experiences. If mom had a run-in with predators, her offspring have helmets, an effect one wag called "bite the mother, fight the daughter." If mom lived her life unthreatened, her offspring have no helmets. Same DNA, different traits. Somehow, the experience of the mother, not only her DNA sequences, has been transmitted to her offspring."
- ^ Preer JR (March 2006). "Sonneborn and the cytoplasm". Genetics 172 (3): 1373–7. PMC 1456306. PMID 16554410. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1456306.
- ^ Preer JR (February 1997). "Whatever happened to paramecium genetics?". Genetics 145 (2): 217–25. PMC 1207789. PMID 9071578. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1207789.
- ^ "Cortical Inheritance - Paramecium, Tetrahymena:, Teutophrys, Dileptus, Paramecium:, Pattern Formation: Ciliate Studies and Models - Cell, Cells, Structures, Prion, Genetic, and Information". Science.jrank.org. http://science.jrank.org/pages/48371/Cortical-Inheritance.html. Retrieved 2011-06-30.
- ^ by Sharon BegleyJanuary 17, 2009 (2009-01-17). "Begley: Was Darwin Wrong About Evolution?". Newsweek. http://www.newsweek.com/2009/01/16/the-sins-of-the-fathers-take-2.html. Retrieved 2011-06-30.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Cortex — (Latin: bark , rind , shell or husk ) may refer to: Contents 1 Sciences 2 Anatomy 2.1 Organs 2.1.1 The brain 3 … Wikipedia
syndrome — The aggregate of symptoms and signs associated with any morbid process, and constituting together the picture of the disease. SEE ALSO: disease. [G. s., a running together, tumultuous concourse; (in med.) a concurrence of symptoms, fr. syn,… … Medical dictionary
Disease — Illness or sickness often characterized by typical patient problems (symptoms) and physical findings (signs). Disruption sequence: The events that occur when a fetus that is developing normally is subjected to a destructive agent such as the… … Medical dictionary
Dysplasia — Abnormal in form. From the Greek dys (bad, disordered, abnormal) and plassein (to form). For example, retinal dysplasia is abnormal formation of the retina during embryonic development. * * * Abnormal tissue development. SEE ALSO: heteroplasia.… … Medical dictionary
Huntington's disease — Classification and external resources A microscope image of … Wikipedia
Cataract — A clouding of the lens of the eye. The normally clear aspirin sized lens of the eye starts to become cloudy. The result is much like smearing grease over the lens of a camera. It impairs normal vision. There are many causes of cataracts including … Medical dictionary
Tuberous sclerosis — Infobox Disease Name = Tuberous sclerosis Caption = Earliest illustration, from Rayer s atlas of skin diseases, 1835. DiseasesDB = 13433 ICD10 = ICD10|Q|85|1|q|80 ICD9 = ICD9|759.5 ICDO = OMIM = 191100 MedlinePlus = 000787 eMedicineSubj = neuro… … Wikipedia
Pachygyria — DiseaseDisorder infobox Name = Pachygyria ICD10 = ICD10|Q|04|3|q|00 ICD9 = Pachygyria (from the Greek pachy meaning thick or fat gyri) is a congenital malformation of the cerebral hemisphere. It results in unusually thick convolutions of the… … Wikipedia
animal behaviour — Introduction any activity of an intact organism. A living animal behaves constantly in order to survive, and all animals must solve the same basic problems. They must, for instance, periodically replace their energy source (consume… … Universalium
DAB1 — disabled homolog 1 (Drosophila) Available structures PDB 1nu2 … Wikipedia