BIOLOGY VOL. II
16th Edition
ISBN: 9781308795317
Author: Raven
Publisher: Mcgraw-Hill/Create
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Textbook Question
Chapter 25, Problem 6S
Having read all of this chapter return to the clam that the difference between direct and indirect development in sea urchins is caused by a change in few expression, not differences in genes. Starting at the level of DNA sequence, formulate an argument in support of the claim.
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Chapter 25 Solutions
BIOLOGY VOL. II
Ch. 25 - Heterochrony is a. the alteration of the spatial...Ch. 25 - Vast differences in the phenotypes of organisms as...Ch. 25 - Homoplastic structures a can Involve convergence...Ch. 25 - Hox genes are a. found in both plants and animals....Ch. 25 - The Brachyury and Thx5 in vertebrates and the Ap3...Ch. 25 - Which of the following statements about Pax6 is...Ch. 25 - Which of the following statements about TbxS is...Ch. 25 - Prob. 8UCh. 25 - Transcription factors are a. genes. b. sequences...Ch. 25 - Independently derived mutations of the CTC gene in...
Ch. 25 - Prob. 1ACh. 25 - Prob. 2ACh. 25 - The Eda allele that causes reduced armor...Ch. 25 - Prob. 4ACh. 25 - The paired-like homeodomain transcription factor 1...Ch. 25 - From the chapter on evolution of development it...Ch. 25 - Phenotypic diversity among major groups of...Ch. 25 - Critique the argument that eyes have multiple...Ch. 25 - Prob. 5SCh. 25 - Having read all of this chapter return to the clam...
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- Make a table to identify amle and female homologues and describe it common function. Minimum of 7 organs.arrow_forwardBriefly describe how the HoxC-6 gene affects vertebrate development.arrow_forwardDNA sequences called homeoboxes help homeotic genes in animals direct development. Given that they are common to flies and mice, explain why these animals are so different.arrow_forward
- pls answer both questions, as there is no need for explanation 1. what type of cleavage pattern according to mitotic spindle orientation do insects possess?a. radial cleavageb. bilateral cleavagec. rotational cleavaged. dextral spiral cleavagee. sinistral spiral cleavage2. what type of cleavage pattern according to mitotic spindle orientation do reptiles possess?a. radial cleavageb. bilateral cleavagec. rotational cleavaged. dextral spiral cleavagee. sinistral spiral cleavagearrow_forwardGive typing answer with explanation and conclusion early accumulation of beta-catenin in the nuclei of cells on one side of the Xenopus embryo. Which side does this specify? Describe briefly how the action of B-catenin lead to specification of Spemann’s organizer.arrow_forwardWhich of the following describes the importance of the formation of the morula in earlyhuman development?A. it is the process that initiates gastrulationB. it is the process that initiates the formation of the epiblast and hypoblastC. it is the process that initiates the formation of the trophoblast and inner cell massD. it is the process that initiates the formation of the trophoblast and epiblastarrow_forward
- From a 24-hour chick embryo, provide the answers in the following: Pairs of somites in a 24-hour chick embryo Germ layer/s that forms the head process What begins the formation head of process Germ layer/s that form the proamnion Explain why the notochord is not visible in areas where the somites are seenarrow_forwardA. How did Spemann separate the two cells of the embryo of a salamander in 1902? B. The process of removing a nucleus is calledarrow_forwardDevelopment of an animal is controlled by the genes that are expressed during development. What roles have been proposed for Hox genes in the evolution and morphology of animal species? Group of answer choices 1. Variation in the Hox genes may have spawned the formation of many new body plans. 2. All of these descriptions are correct. 3. The number and arrangement of Hox genes varies among different types of animals. 4. Increases in the number of Hox genes may have led to greater complexity in body structure.arrow_forward
- The similarities in embryonic development shown in the diagrams suggest that these organisms-arrow_forwardStudy the sea star development slides, including early and late stages and identify the following stages and structures: zygote, two cell stage, morula (stage), blastula (stage), blastocoel (cavity), archenteron (cavity), ectoderm (layer), endoderm (layer), gastrula (stage). **See Table 52.1, Section 52.3 & 52.4 in textbook ** Why is it useful to study the development of sea stars (Echinodermata) when studying human development? What do the two have in common?arrow_forwardReview the stages of early development in animals. How are these stages similar in the animals you have studied? How do they differ? Complete Table 25.3. Thank youarrow_forward
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