Comparing DNA sequences from living taxa and calibrating their rates of change with at least one well-dated fossil allows scientists to create time-calibrated trees with minimum and maximum age estimates for all branch points
Such studies are called ________ [two words] studies. Fill in the blank(s) with correct word
molecular clock
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An experimenter wanted to test the effects of cigarette smoking on rats. She infused the cages of 50 rats with cigarette smoke and the cages of another 50 rats with pure, clean air. The rats that received the clean air were the ____
a. experimental group b. control group c. model group d. predictive group e. independent group
The snakes include some rather short and some incredibly long species, with a variation from about 100 to over 300 vertebrae. What developmental mechanism is the best candidate for changing the number of vertebrae in evolution?
A. Changes in genes that lay down extracellular matrix in bone B. Changes in genes necessary for neural crest development C. Changes in genes that control mitosis D. Changes in the somitogenesis clock Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the development of vertebrae? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following has been correlated
with the ability of rats to cope with stress as adults? a. A nurturing mother. b. The number of siblings they have. c. The temperature they are raised in. d. The altitude they are born at. e. All of these.
Two species of cattail (Typha) live in shallow water along the shoreline of ponds. Although T. agustifolia can live by itself in water 0-20 cm deep, in the presence of T. latifolia, it occurs only in water > 20 cm deep, whereas T
latifolia occurs in shallower water. In this example, T. agustifolia is limited by competition exploiting its A) ecological niche. B) fundamental niche. C) realized niche. D) physiological niche.