Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Textbook Question
Chapter 26.1, Problem 4CC
WHAT IF? What would the human life cycle be like if we had alternation of generations? Assume that the multicellular diploid stage would be similar in form to an adult human.
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Chapter 26 Solutions
Campbell Biology in Focus
Ch. 26.1 - Why do researchers identify charophytes rather...Ch. 26.1 - Prob. 2CCCh. 26.1 - Prob. 3CCCh. 26.1 - WHAT IF? What would the human life cycle be like...Ch. 26.2 - Prob. 1CCCh. 26.2 - Describe the importance of mycorrhizae, both today...Ch. 26.2 - MAKE CONNECTIONS Review Figures 8 .3 and 8.5. If a...Ch. 26.3 - Prob. 1CCCh. 26.3 - Prob. 2CCCh. 26.3 - MAKE CONNECTIONS Monilophytes and seed plants both...
Ch. 26.4 - What features not present in seedless plants have...Ch. 26.4 - Explain why Darwin called the origin of...Ch. 26.4 - MAKE CONNECTIONS Suppose the Bennettitales and...Ch. 26.5 - Prob. 1CCCh. 26.5 - Prob. 2CCCh. 26.5 - MAKE CONNECTIONS Figure 1.9 illustrates the...Ch. 26.5 - Prob. 4CCCh. 26 - Prob. 1TYUCh. 26 - Which of the following characteristics of plants...Ch. 26 - Prob. 3TYUCh. 26 - Prob. 4TYUCh. 26 - Prob. 5TYUCh. 26 - DRAW IT Use the letters a-d to label where on the...Ch. 26 - SCIENTIFIC INQUIRY INTERPRET THE DATA The grass...Ch. 26 - FOCUS ON EVOLUTION The history of life has been...Ch. 26 - FOCUS ON INTERACTIONS Giant lycophyte trees of...Ch. 26 - SYNTHESIZE YOUR KNOWLEDGE These stomata are from...
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- WHAT IF? The researchers needed further evidence, so they injectedbicoid mRNA into the anterior end of an egg from a female with a mutationdisabling the bicoid gene. Given that the hypothesis was supported, whatmust their results have been?arrow_forwardWHAT IF? Propose a possible reason that the firstnaturally occurring mutant fruit fly Morgan sawinvolved a gene on a sex chromosome and was foundin a male.arrow_forwardWHAT IF? If the ventral cells of an early frog gastrulawere experimentally induced to express large amountsof a protein that inhibits BMP-4, could a second embryodevelop? Explain.arrow_forward
- Apply Evolutionary Thinking When a biologist first tested a new pesticide on a population of insects, she found that only 1% of the insects survived their exposure to the poison. She allowed the survivors to reproduce and discovered that 10% of the offspring survived exposure to the same concentration of pesticide. One generation later, 50% of the insects survived this experimental treatment. What is a likely explanation for the increasing survival rate of these insects over time?arrow_forwardMAKE CONNECTIONS Look at Figure 12.7 and imagine the twodaughter cells undergoing another round of mitosis, yielding four cells.Compare the number of chromosomes in each of those four cells, aftermitosis, with the number in each cell in Figure 13.8, after meiosis. Whatis it about the process of meiosis that accounts for this difference, eventhough meiosis also includes two cell divisions?arrow_forwardWHAT IF? If maternal and paternal chromatids havethe same two alleles for every gene, will crossing overlead to genetic variation?arrow_forward
- Think Critically. Provide a concise explanation of your answer. A mutation on an autosome causes a particular protein to be overproduced, and the excess protein accumulates in the liver and damages it. Would the resulting disorder most likely be inherited in an autosomal dominant or recessive pattern? Expression of the SYR gene on the Y chromosome gives rise to the male phenotype in humans. What do you think the inheritance pattern of SYR alleles is called? 22q11.2 deletion syndrome, also called DiGeorge syndrome, causes atypical parathyroid glands, a heart defect, and an underdeveloped thymus gland. About 85% of patients have a microdeletion of part of chromosome 22. A girl, her mother, and a maternal aunt have very mild DiGeorge syndrome. They all have a reciprocal translocation of chromosomes 22 and 2. How can a microdeletion and a translocation cause the same symptoms? Why were the people with the translocation less severely affected than the people with microdeletion? What other…arrow_forwardMAKE CONNECTIONS Review Figure 12.16 on cell cyclecontrol. Would you expect MPF (maturation-promotingfactor) activity to remain steady during cleavage? Explain.arrow_forward1.) In your own world, define zoology 2.) Describe the Hierarchical organization of life. How does this organization lead to the emergence of new properties at different levels of biological complexity? 3.) What contributed to the formulation of chromosomal theory of inheritance? 4.) What is the purpos of cell division? 5.) In humans, why there are 23 chromatids (chromosomes) after Meiosis II? 6.) What is the main difference between cell division in plants and animals?arrow_forward
- Task: Show your work/explain your reasoning as much as possible. If a certain species has a DNA content of 12 picograms in each diploid cell's nucleus when the cell in in G1 of the cell cycle, what would be the expected DNA content (in picograms) of a triploid cell (from the same species) in mitotic prophase? Consider ploidy changes and/or chromosome form changes, if applicable, when explaining your reasoning.arrow_forwardTest Your Understanding 2. At which of the following stages do human skin cell nuclei have the same DNA content? (a) early mitotic prophase and late mitotic telophase (b) G1 and G2 (c) G1 and early mitotic prophase (d) G1 and late mitotic telophase (e) G2 and late mitotic telophasearrow_forwardWHAT IF? After the synaptonemal complex disappears,how would any pair of homologous chromosomes beassociated if crossing over did not occur? What effectmight this have on gamete formation?arrow_forward
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