Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Textbook Question
Chapter 20.3, Problem 1CC
Based on current knowledge, how would you explain the difference in the percentage of tadpoles that developed from the two kinds of donor nuclei in Figure 20.16?
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To conduct their experiment, the researchers collected L. peronii eggs from a natural stream. After the eggs had hatched, tadpoles were raised in artificially constructed 2 L containers in a laboratory. All containers were filled with 1 L of filtered tap water, and the water was changed every other day. Thirteen tadpoles were placed in each container, and the tadpoles were exposed to a 12-hour light: 12-hour dark photoperiod. All tadpoles were fed thawed spinach daily.
The researchers randomly placed the tadpoles into containers exposed to one of four treatments, with nine replicates of each treatment, as follows:
Low UVBR (<6.0 kJ/m2), low temperature (15OC)
Low UVBR (<6.0 kJ/m2), high temperature (26OC)
High UVBR (>70.0 kJ/m2), low temperature (15OC)
High UVBR (>70.0 kJ/m2), high temperature (26OC)
The researchers recorded the number of tadpoles still alive out of the original 13 in a container (percent survival) at different time periods. Their results at Week 4,…
An additional notochord is grafted next to the developing neural tube. Answer the following questions. (a) what new cells would you expect to develop in the region of the neural tube closest to the graft? (b) What is the notochord-derived molecule that is responsible for the effect?
Chapter 20 Solutions
Campbell Biology: Custom Edition
Ch. 20.1 - Prob. 1CCCh. 20.1 - DRAW IT One Strand of a DNA molecule has the...Ch. 20.1 - What are some potential difficulties in using...Ch. 20.1 - VISUAL SKILLS Compare Figure 20.7 with Figure...Ch. 20.2 - Prob. 1CCCh. 20.2 - Prob. 2CCCh. 20.3 - Based on current knowledge, how would you explain...Ch. 20.3 - Prob. 2CCCh. 20.3 - Prob. 3CCCh. 20.4 - What is the advantage of using stem cells for gene...
Ch. 20.4 - Prob. 2CCCh. 20.4 - Prob. 3CCCh. 20 - Describe how the process of gene doning results in...Ch. 20 - What useful Information is obtained by detecting...Ch. 20 - Describe how, using mice. a researcher could carry...Ch. 20 - What factors affecf whether a given genetic...Ch. 20 - In DNA technology, the term vector can refer to...Ch. 20 - Which of the following tools of DNA technology is...Ch. 20 - Prob. 3TYUCh. 20 - A paleontologist has recovered a bit of tissue...Ch. 20 - DNA technology has many medical applications....Ch. 20 - Which of the following is not true of cDNA...Ch. 20 - Expression of a cloned eukaryotic gene in a...Ch. 20 - Which Ii of the following sequences in...Ch. 20 - Prob. 9TYUCh. 20 - MAKE CONNECTIONS Looking at Figure 20.15, what...Ch. 20 - DRAW IT You are cloning an aardvark gene, using a...Ch. 20 - EVOLUTlON CONNECTION Ethical considerations aside,...Ch. 20 - Prob. 13TYUCh. 20 - Prob. 14TYUCh. 20 - The water in the Yellowstone National Park hot...
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