Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers and the other has white, terminal flowers; all F1 individuals have red, axial flowers. If 1,000 F2 offspring resulted from the cross, approximately how many of them would you expect to have red, terminal flowers?
A) 65
B) 190
C) 250
D) 565
E) 750
Answer: B) 190
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The hormone that helps us respond to low oxygen levels by promoting an increase in red blood cell counts is
A. erythropoietin. B. hemopoeitin. C. renin-angiotensin. D. adrenocorticotropin. E. estradiol.
Diatoms have a special problem
A. because their + and - mating strains are nonmotile and have to be dispersed by currents B. because their heavy siliceous shells impede conjugation C. because they must await a chemical signal from a fish before they can become mobile and search for mating partners D. because their two halves fit like the lid and body of a pillbox and on repeated cell divisions the half that is overlapped gets progressively smaller E. because the gametes experience difficulty in exiting the overlapping halves of their siliceous shells
Moistening and lubrication of food occurs in
the human a. mouth. b. esophagus. c. stomach. d. duodenum. e. jejunum
The fact that tracheophytes can survive on land is due to which of the following?
A. alternation of generations B. A dominant gametophyte stage C. Adaptation to damp habitats D. Water transport through vascular tissues E. Mechanisms other than photosynthesis for carbohydrate production