Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Chapter 33, Problem 6TYU
MAKE CONNECTIONS In Figure 33.8, assume that the two medusae shown ai step 4 were produced by one polyp colony. Review Concept 12.1 and Concept 13.3, and then use your understandingof mitosisand meiosis to evaluate whether the following sentence is Irue oi false; if false, seiet t the am wer that providcs the correct reason. Although the two medusae are genetically identical, a sperm produced by one will differ genetically front an egg produced by the other.
- (A) False {both the medusae and the gametes are genetically identical)
- (B) False (neither the medusae nor the gametes are genetically identical)
(C) False {the medusae are not identical but the gametes are)
(D) True
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Chapter 33 Solutions
Campbell Biology: Custom Edition
Ch. 33.1 - Prob. 1CCCh. 33.1 - Prob. 2CCCh. 33.2 - Compare and contrast the polyp and medusa forms of...Ch. 33.2 - VISUAL SKILLS Use the cnidarian life cycle...Ch. 33.2 - MAKE CONNECTIONS Many new animal body plans...Ch. 33.3 - Prob. 1CCCh. 33.3 - Prob. 2CCCh. 33.3 - MAKE CONNECTIONS Explain how the molluscan foot...Ch. 33.4 - Prob. 1CCCh. 33.4 - Describe two adaptations that have enabled insects...
Ch. 33.4 - MAKE CONNECTIONS Historically, annelids and...Ch. 33.5 - Prob. 1CCCh. 33.5 - WHAT IF? The insect Drosophila melanogaster and...Ch. 33.5 - MAKE CONNECTIONS Describe how the features and...Ch. 33 - Lacking tissues and organs, how do soonges...Ch. 33 - Describe the cnidarian body plan and its two major...Ch. 33 - is the lophotrochozoan clade united by unique...Ch. 33 - Describe some ecological roles of nematodes and...Ch. 33 - You've read that echinoderms and chordates are...Ch. 33 - A land snail, a clam and an octopus all share...Ch. 33 - Prob. 2TYUCh. 33 - The water vascular system of echinoderms (A)...Ch. 33 - Prob. 4TYUCh. 33 - In Figure 33.2, which two main clades branch from...Ch. 33 - MAKE CONNECTIONS In Figure 33.8, assume that the...Ch. 33 - Evolution connection Interpret thf data Draw a...Ch. 33 - Prob. 8TYUCh. 33 - Prob. 9TYUCh. 33 - SYNTHESIZE YOUR KNOWLEDGE Colleclively, do these...
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- The Cavendish banana, the world’s most popular fruit, is currently threatened by extinction due to a fungus. This bananavariety is “triploid” (3n, with three sets of chromosomes) andcan only reproduce through cloning by cultivators. Givenwhat you know about meiosis, explain how the banana’s triploid number accounts for its inability to form normal gametes.Considering genetic diversity, discuss how the absence ofsexual reproduction might make this domesticated speciesvulnerable to infectious agents.arrow_forwardIn the moss Polytrichum commune, the haploidchromosome number is 7. A haploid male gametefuses with a haploid female gamete to form a diploid cell that divides and develops into the multicellular sporophyte. Cells of the sporophyte thenundergo meiosis to produce haploid cells calledspores. What is the probability that an individualspore will contain a set of chromosomes all ofwhich came from the male gamete?arrow_forwardOffer evidence in support of the hypothesis that meiosis evolvedfrom mutations in the process of mitosis.arrow_forward
- It is possible that an alternative mechanism for generating germ cells could have evolved. Consider meiosis in a germ cell precursor (a cell that is diploid but will go on to make gametes). If the S phase were skipped, which meiotic division (meiosis I or meiosis II) would no longer be required?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_forwardWhy the concepts of haploid number, diploid number, andhomologous chromosomes are important for understandingthe process of meiosis ?arrow_forward
- What is the corect order of these meiotic events? A Segregation of homologous chromosomes to opposite poles 8 Segregation of sister chromatids to opponite poles. CAignment of homologous pairs on the midplate of thve cell. D Pairing and synapsis of homologous chromosomes. E Condensation of chromosomes in a diploid nucleus. CDEAB O DCERA O EDCBA O EDCAB O DCAREarrow_forwardGiven that the first division of the zygote divides the embryo into the future right and left halves of the butterfly, complete a hypothesis that explains how nondisjunction during the first mitosis might have produced this unusual-looking butterfly. Match the terms In the left column to the approprlate blanks In the sentences on the right. Not all terms will be used. Reset Help female The zygote has the genotype. If nondisjunction occurs during the first mitosis the left cell will have the genotype and develops to the half. The right half. daughter cell will have the genotype and develops to the XXXX XX male XXX XYarrow_forwardSome organisms—for example, certain fungi—reproduce asexually when the environment is favorable and sexually when the environment becomesunfavorable. What might be the evolutionary advantage of sexual reproduction with the associated process of meiosis during unfavorable conditions?arrow_forward
- Which of these are true statements about meiosis? Select all that apply O It results in cells that are genetically identical to the original cell It results in cells that are genetically different from each other and the original cell O It produces cells needed for sexual reproduction O It is the process by which multicellular organisms grow and develop O It produces cells with half as many chromosomes as the original cellarrow_forward22. Ovary II. Altemate response C. If statement A is correct and B is wrong. D. If statement A is wrong and B is correct. A. f both statements are correct. B. If both statements are wrong. gium in tho anther contains numerous microsporocytes which will undergoarrow_forwardit is possible that an alternative mechanism for generating germ cells could have evolved. consider meiosis in a germ cell precursor. if the S shape were skipped, whic meiotic devision would no longer be required.arrow_forward
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