Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 47, Problem 6TYU
In humans, identical twins are possible because
- a. cytoplasmic determinants are distributed unevenly in unfertilized eggs.
- b. extraembryonic cells interact with the Zygote nucleus.
- c. convergent extension occurs.
- d. early blastomeres ean form a complete embryo if isolated.
- e. the gray crescent divides the dorsal-ventral axis into new cells.
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Gastrulation...
A. Is a specialized form of cell division that partitions the cytoplasm of a fertilized egg
B. Refers to the fusion of haploid gametes to give a diploid zygote
C. Produces an embryo with either two or three distinct cell layers
D. Is a developmental stage consisting of a cell layer surrounding a fluid-filled space
E. None of the above
Which of the following is not true about starfish eggs? Choose all possible answers
a. eggs are fertilized prior to completion of the first meiotic divisions.
b. eggs are generally less yolky and therefore cleave meroblastically.
c. first two cleavage planes are meridional
d. Each quartet (blastomeres) occupies a plane lying perpendicular to the animal-vegetal axis.
e. All are true about the starfish eggs.
A preembryo has:- a. A neural tube. b. A heart bulge. c. A cytotrophoblast. d. A coelom. e. decidual cells
Chapter 47 Solutions
Campbell Biology
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 - What are some functions of apoptosis in...Ch. 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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- Invagination of the sea urchin blastulaA. is preceded by changes in the shape of individual blastomeres.B. involves the filopodia of secondary mesenchyme cells.C. is due to the uneven distribution of various transcriptional regulatory proteins in the egg cytoplasm.D. forms the archenteron.E. All of the abovearrow_forwardWhich of the following statements is/are true? A. Spermatogenesis is an example of asymmetric cell division. B. The formation of a mature egg occurs through symmetric cell division. C. Spermatogenesis and oogenesis are both examples of asymmetric cell division. D. Spermatogenesis involves only symmetric cell division whereas oogenesis involves asymmetric cell division.arrow_forwardThe cells that give rise to gametesa. are derived from the mesoderm.b. often arise independently from the three germ layers.c. originate directly from the tissue that will develop into thegonads.d. are some of the last cells of the embryo to differentiate.e. are formed the same way in all animals.arrow_forward
- Which of the following is true about Cleavage? Choose all possible answers a. At the end of cleavage, a 32-cell zygote called morula is formed. b. The angle and timing of mitotic spindle influence the pattern of embryonic cleavage. c. Cleavage is a series of mitosis that happens after the formation of zygote. d. The yolk protein is essential in determining where cleavage can occurarrow_forwardDuring gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the three primary germ layers. a. notochord b. hypoblast c. epiblast d. mesoblastarrow_forwardChoose the best of the following The identity of each segment of a developing embryo is controlledby:a. fate mapsb. gray crescentc. homeotic genesd. the blastocyste. None of these are correct.arrow_forward
- Sea urchins exhibit a holoblastic cleavage pattern. What factor contribute to this cleavage pattern? a. The amount/distribution of yolk b. Conditional specification of the vegetal layer by large micromeres c. The angle of the mitotic spindle and its time of formation d. Maternal factorsarrow_forwardGiven these structures:(1) blastocyst (2) morula (3) zygoteChoose the arrangement that lists the structures in the order in whichthey form during development.a. 1,2,3 c. 2,3,1 e. 3,2,1b. 1,3,2 d. 3,1,2arrow_forwardMatch the germ layer on the right with its contribution to the tissues and organs of the embryo, on the left. v connective tissue stroma A. mesoderm v parenchymal cells, e.g., liver B. ectoderm C. mesoderm D. mesoderm E. endoderm F. endoderm vasculature v innervation v epithelium of enteric secretory duct tubes v epithelium of integumentary system G. ectoderm v elastic membranearrow_forward
- 1. During oogenesis, oogenetic inhibitors must be deactivated after full growth to allow the a. oogonium to undergo mitosis. b. ootid to transform into a zygote. c. primary oocyte to complete the first meiotic division. d. secondary oocyte to complete the second meiotic division. 2. Which of the following layers protect the mammalian oocyte during ovulation? * a. cortical and hyaline layers. b. vitelline envelope and jelly coat. c. granulosa cells and zona radiata. d. corona radiata and zona pellucida. 3. After ovulation, the following cells are transformed to lutein cells EXCEPT * a. theca cells. b. corona radiata cells. c. cumulus oophorus cells. d. stratum granulosum cells.arrow_forwardDuring morphogenesis, gastrulation does which of the following?A. Gastrulation produces the ectoderm through formation of a blastocyst.B. Gastrulation produces the mesoderm to form the lining of the digestive tract.C. Gastrulation provides the mechanisms whereby cells can form the neural tube.D. Gastrulation produces the endoderm through invagination of the blastula.arrow_forwardMatch the developmental genetics terms with their correct definition. a molecule that gives cells positional information according to its concentration. A. Morphogen B. the spatial arrangement of different regions of the body. body pattern C. the developmental phase during which germ layers become separated from each other. gastrulation D. one of three layers of cells that produce tissues and organs in either the inside, middle, or outside of the embryo. , germ layer how cells rearrange to adopt the three dimensional shape of an organ or tissue. E. the process by which cells adopt their final physiological state. F.arrow_forward
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