If myoglobin is found in all chordates, urochordates, and cephalochordates, b-globin is found in all vertebrates, a-globin in all ostracoderm descendants, z-globin in all gnathostomes, e-globin in all viviparous mammals, and g-globin in all placental mammals, then the most recent globin gene must be:

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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If myoglobin is found in all chordates, urochordates, and cephalochordates, b-globin is found in all vertebrates, a-globin in all ostracoderm descendants, z-globin in all gnathostomes, e-globin in all viviparous mammals, and g-globin in all placental mammals, then the most recent globin gene must be:

  1. epsilon-globin (e-globin), found only in descendants of the ancestral marsupials
  2. myoglobin, found only in descendants of the chordates, urochordates, and cephalochordates
  3. gamma-globin (g-globin), found only in descendants of the ancestral placentals
  4. zeta-globin (z-globin), found only in descendants of the ancestral gnathostome fishes
  5. beta-globin (b-globin), found only in descendants of the ancestral vertebrates
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