Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 46.1, Problem 3CC
WHAT IF? → If a hermaphrodite self-fertilizes, will the offspring be identical to the parent? Explain.
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WHAT IF? Why did the researchers split each female frog’s eggs into twobatches for fertilization by different males? Why didn’t they mate each femalewith a single male frog?
Let's Check
Activity 9. Let us try to check your understanding of the discussion. Read the questions
carefully. Encircle the letter that corresponds to the correct answer.
1. Which of the following pairs share 50% of their genes?
Any two siblings
A pair of dyzogotic twins
A pair of monozygotic twins
a and b
2. Regarding types of multiple pregnancy, which of the following are true?
a. Dizygotic twins result from fertilization of different oocytes by the same sperm.
b. Monozygotic twins result from mitotic division of a single zygote into 'identical' twins.
c. Dizygotic twins result from the division of a single fertilized egg.
d. Monozygotic twins result from 2 egg cells merged together, eventually fertilized by a sperm
cell.
3. Fraternal twins make up approximately.
of the twin population.
Explain further each number.
What are the 4 major events comprising the process of fertilization?
What are the strategies employed by animals for success of the egg meeting the sperm?
Chapter 46 Solutions
Campbell Biology
Ch. 46.1 - Compare and contrast the outcomes of asexual and...Ch. 46.1 - Parthenogenesis is the most common form of asexual...Ch. 46.1 - WHAT IF? If a hermaphrodite self-fertilizes, will...Ch. 46.1 - Prob. 4CCCh. 46.2 - How does internal fertilization facilitate life on...Ch. 46.2 - What mechanisms have evolved in animals with (a)...Ch. 46.2 - MAKE CONNECTIONS What are the shared and distinct...Ch. 46.3 - Why might frequent use of a hot tub make it harder...Ch. 46.3 - Prob. 2CCCh. 46.3 - WHAT IF? If each vas deferens in a male was...
Ch. 46.4 - How are the functions of FSH and LH in females and...Ch. 46.4 - How does an estrous cycle differ from a menstrual...Ch. 46.4 - WHAT IF? If a human female begins taking...Ch. 46.4 - Prob. 4CCCh. 46.5 - Prob. 1CCCh. 46.5 - In what ways are tubal ligation and vasectomy...Ch. 46.5 - Prob. 3CCCh. 46 - Would a pair of haploid offspring produced by...Ch. 46 - Identify which of the following, if any, are...Ch. 46 - How does the difference in size and cellular...Ch. 46 - Prob. 46.4CRCh. 46 - Prob. 46.5CRCh. 46 - Prob. 1TYUCh. 46 - In male mammals, excretory and reproductive...Ch. 46 - Prob. 3TYUCh. 46 - Prob. 4TYUCh. 46 - Prob. 5TYUCh. 46 - Prob. 6TYUCh. 46 - Prob. 7TYUCh. 46 - Prob. 8TYUCh. 46 - DRAW IT In human spermatogenesis, mitosis of a...Ch. 46 - Prob. 10TYUCh. 46 - SCIENTIFIC INQUIRY You discover a new egg-laying...Ch. 46 - WRITE ABOUT A THEME: ENERGY AND MATTER In a short...Ch. 46 - SYNTHESIZE YOUR KNOWLEDGE A female Komodo dragon...
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- Fertilization: a) Briefly describe the process of fertilization in humans, b) identifying key aspects that stop sperms from different species to fertilize human oocytes, and c) identifying also key aspects that prevent polyspermy.arrow_forwardExplain the chromosomal and genetic control of sex determination in mammals. Clearly establish the difference between the primary and the secondary phases.arrow_forwardIn vertebrate animals, spermatogenesis and oogenesis differ, in that 1.) Cytokinesis is unequal in oogenesis whereas it i equal in spermatogenesis 2.) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born 3.) Oogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatozoon 4.) Oogensis ends at menopause. Whereas spermatogenesis is finished before birth 5.) Oogensis begins at the onset of sexual maturity whereas spermatogenesis happens in embryonic developmentarrow_forward
- Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following. (a) The animals are small in size and want to produce more offsprings. (b) Food is available in plenty in water. (c) To ensure better chance of fertilisation. (d) Water promotes production of large number of gametes.arrow_forwardTest Your Understanding 13 EVOLUTION LINK Contrast the biological advantages of hermaphroditism that involves cross-fertilization with hermaphroditism that involves self-fertilization.arrow_forward7. Maternal effect: In Limnaea snail cats, R makes right coiled shells; r makes left coiled shells, and R is dominant to r, as we discussed in class. Even though these can be hermaphrodites, and act either as mom or dad, we'll just pretend they are male or female. A Rr male marries an rr female. a) What are the genotypes of their offspring and in what ratio? b) What are the phenotypes of their offspring and in what ratio?arrow_forward
- example of how some species switch between asexual and sexual reproduction? Compare and contrast gametogenesis of sperm and eggs in mammals. In your comparison, describe three similarities and three Compare and contrast external versus internal fertilization. Describe at least three major differences. What is meant by 'sperm competition'? What is 'second male advantage'? Describe the case study of Drosophila melanogaster in your text. Describe the difference between oviparous, viviparous, and ovoviviparous. What evolutionary pressures would favor one form over the other? Use your text to identify all the structures in the figures below. Also provide a brief description of each structures function. male reproduction anatomy female reproductive anatomyarrow_forwardWhy are sea urchins have external fertilization? What are the adaptive advantages of external fertilization? How about internal fertilization?arrow_forwardDescribe the three major parts of a spermatozoon and state what organelles or cytoskeletal components are contained in each?arrow_forward
- a. What are the physical differences and similarities in the reproduction systems of plants and animals? b. What is the difference of morphogenesis in plants and animals?arrow_forward2)Why are organisms that broadcast spawn useful for studying fertilization & development? a)Fertilization does not require multiple gametes b)Fertilization occurs outside the bodies of the parents, so it can be directly observed c)Fertilization is observable because the eggs are large enough to see d)Fertilization occurs without the need for parentsarrow_forwardN Question How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?arrow_forward
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