Campbell Biology: Custom Edition For The University Of Maryland
15th Edition
ISBN: 9781269920490
Author: Reece, Urry, Cain, Wasserman, Minorsky, Jackson
Publisher: Pearson Custom Publishing
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Chapter 47, Problem 13TYU
SYNTHESIZE YOUR KNOWLEDGE
Occasionally, two-headed animals such as this turtle are born. Thinking about the occurrence of identical twins and the property of totipotency, explain how this might happen.
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Chapter 47 Solutions
Campbell Biology: Custom Edition For The University Of Maryland
Ch. 47.1 - How does the fertilization envelope form in sea...Ch. 47.1 - Prob. 2CCCh. 47.1 - MAKE CONNECTIONS Review Figure 12.16 on cell...Ch. 47.2 - In the frog embryo, convergent extension elongates...Ch. 47.2 - WHAT IF? Predict what would happen if Ca2+ was...Ch. 47.2 - MAKE CONNECTIONS Unlike some other types of birth...Ch. 47.3 - Prob. 1CCCh. 47.3 - Prob. 2CCCh. 47.3 - Prob. 3CCCh. 47.3 - Prob. 4CC
Ch. 47 - What cell-surface event would likely fail if a...Ch. 47 - Prob. 47.2CRCh. 47 - Suppose you found two classes of mouse mutations,...Ch. 47 - Prob. 1TYUCh. 47 - Which of the following is common to the...Ch. 47 - The archenteron develops into a. the mesoderm. b....Ch. 47 - What structural adaptation in chickens allows them...Ch. 47 - Prob. 5TYUCh. 47 - In humans, identical twins are possible because a....Ch. 47 - Cells transplanted from the neural tube of a frog...Ch. 47 - DRAW IT Each blue circle in the figure below...Ch. 47 - EVOLUTION CONNECTION Evolution in insects and...Ch. 47 - Prob. 10TYUCh. 47 - Prob. 11TYUCh. 47 - Prob. 12TYUCh. 47 - SYNTHESIZE YOUR KNOWLEDGE Occasionally, two-headed...
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- Test Your Understanding 13 EVOLUTION LINK Contrast the biological advantages of hermaphroditism that involves cross-fertilization with hermaphroditism that involves self-fertilization.arrow_forwardTest Your Understanding 16 SCIENCE, TECHNOLOGY, AND SOCIETY The incidence of abortion has declined more in countries where abortions are legal (and safe) than in countries in which they are illegal (and unsafe). Can you suggest an explanation?arrow_forwardTest Your Understanding 15 SCIENCE, TECHNOLOGY, AND SOCIETY Why do you think that a variety of effective methods of male contraception have not yet been developed? If you were a researcher, what are some approaches you might take to develop a method of male contraception?arrow_forward
- What are morphogens, exactly? Explain how they affect the patterning of tissue throughout embryonic development. Give 4 concrete instances to back up your claims.arrow_forwardNormal childbirth is driven by a positive feedback loop. Analyze the given diagram and discuss in detail how the positive feedback loop controls child birth.arrow_forwardBirth control pills commonly provide excess progesterone that serves to inhibit (suppress) the actions of FSH and LH through a negative feedback loop. Given the role these hormones (FSH and LH) play, how could this feedback loop prevent a woman from becoming pregnant?arrow_forward
- A: Why do sea urchins have external fertilization? [Discuss the life style of the developing sea urchin embryo in the water column compared to a very different ecological niche of the adults on the ocean floor. Besides, would you want to give live birth to a sea urchin! ouch!] 2: Then why don't the parents take care of the young? [In fact the adults do in a way. After the embryo has grown large enough and metamorphosed into a young urchin they hide in the spines of the adults, living off of the scraps of food produced from the messy eating of the adults] 3: Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?arrow_forwardFill in the blank: A human offspring is called a(an) ___________________ until the end of the eighth week of development.arrow_forwardMost contraceptive pills are designed for the female reproductive system. In a scientific innovation challenge, you are to present an idea for the development of a contraceptive pill for males. From your knowledge of the reproductive and endocrine systems of the male body, tell us how this pill when taken by a male will work to prevent pregnancy.arrow_forward
- pigment in bottom layer? A. melatonin B. melanin C. mesoderm D. ectodermarrow_forwardMammalian sperm don’t live very long after ejaculation.Therefore, for a rhino cow to become pregnant, the sperm must be placed in her vagina or uterus, whether by mating or by artificial insemination, at about the same time that ovulation occurs.The simplest way to ensure correct timing is to induce ovulation and have mating or artificial insemination the same day. How might ovulation be induced, in rhinos or in other mammals?arrow_forwardDesign another experiment to determine whether the signalthat controls male development is a hormone. Make sureto identify your hypothesis, prediction, data collection plan,and controlsarrow_forward
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