EP CONNECT ONLINE ACCESS FOR BIOLOGY
20th Edition
ISBN: 9781260494655
Author: Raven
Publisher: MCG COURSE
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Textbook Question
Chapter 52, Problem 6A
Axis formation in amniotic embryos could be affected by
a. mutations in cells in the dorsal lip of the blastopore.
b. mutations in cells in the primitive streak.
c. Both of the choices are correct.
d. Neither of the choices is correct.
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Students have asked these similar questions
Match 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.
Which of the following statements relating to axis formation in chickens is FALSE?
a. Henson's node secretes proteins that antagonize BMPs.
b. The side of the epiblast facing the negative, basic albumin will become the ventral side of the embryo.
c. Cells of the posterior marginal zone secrete Nodal to initiate the primitive streak.
d. Water and sodium ions are transported from the albumin through the blastodisc cells and into the subgerminal space.
Observations of the developing chick embryo reveal that skeletal muscles develop from the transplanted somites even though motor neurons innervating those muscles arise from chick neural crest cells. Based on these observations, what is MOST likely true?
A.
Neural crest cells differentiate into somites.
B.
Neural crest cells fuse with developing somite cells.
C.
Neural crest cells develop from migrating somite cells.
D.
Neural crest cells send projections into developing somites.
Chapter 52 Solutions
EP CONNECT ONLINE ACCESS FOR BIOLOGY
Ch. 52.1 - Describe the events involved in fertilization.Ch. 52.1 - Prob. 2LOCh. 52.2 - Prob. 1LOCh. 52.2 - Prob. 2LOCh. 52.2 - Prob. 3LOCh. 52.3 - Prob. 1LOCh. 52.3 - Compare gastrulation in different animals.Ch. 52.3 - Name the extraembryonic membranes in amniotes.Ch. 52.4 - Prob. 1LOCh. 52.4 - Prob. 2LO
Ch. 52.4 - Prob. 3LOCh. 52.5 - Prob. 1LOCh. 52.5 - Explain the function of the organizer.Ch. 52.5 - Distinguish between primary and secondary...Ch. 52.6 - Describe the major developmental events in the...Ch. 52.6 - Explain the role of the placenta.Ch. 52.6 - Prob. 3LOCh. 52 - Data analysis Two different genes have mutant...Ch. 52 - Prob. 1IQCh. 52 - Prob. 1UCh. 52 - Which of the following plays the greatest role in...Ch. 52 - Gastrulation is a critical event during...Ch. 52 - Gastrulation in a mammal would be most similar to...Ch. 52 - Prob. 5UCh. 52 - Of the following processes, which occurs last? a....Ch. 52 - Which of the following would qualify as a...Ch. 52 - Prob. 1ACh. 52 - In the Spemann experiment, when the dorsal lip is...Ch. 52 - Suppose that a burst of electromagnetic radiation...Ch. 52 - Prob. 4ACh. 52 - Drug or alcohol exposure during which of the...Ch. 52 - Axis formation in amniotic embryos could be...Ch. 52 - Prob. 1SCh. 52 - You look up from your studying to see your dog,...Ch. 52 - Why doesnt a woman menstruate while she is...Ch. 52 - Spemann and Mangold were able to demonstrate that...
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- If cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface of a second gastrula where skin would normally develop, the transplanted cells will still develop into tissues of the nervous system. This experiment shows that the transplanted cells areA. differentiated.B. totipotent.C. discontinuous.D. determined.E. endodermal.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_forwardWhich of the following is not true about frogs eggs and blastula formation? Choose all possible answers a. denser yolk in the animal hemisphere. b. Cleavage is holoblastic c. first cleavage plane is meridional and bisects the gray crescent, revealing the existence of some factor(s) that determine(s) the initial orientation of the cleavage spindle. d. first furrow also marks the plane of bilateral symmetry in the body e. All four blastomeres differ in sizes. f. All of the following are true about eggs of frogs.arrow_forward
- Which of the following statements describing the mid-blastula transition is CORRECT? a. Cells increase expression of E-cadherin to enhance cell stability. b. Cell division increases to create the germ layers. c. Zygotic genes are activated by demethylation. d. Maternal and zygotic mRNAs provide proteins required prior to the MBT.arrow_forwardWhich of the following statements is FALSE? a. VegT and Veg1 induce both dorsal and ventral mesoderm. b. Veg1 and VegT induce endoderm signals. c. Beta-catenin must enter the nuclei of cells on the dorsal surface for frog development to progress normally. d. Nodal is required to induce both the Organizer and ventral mesoderm.arrow_forwardInvagination 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_forward
- The zona pellucida is important in mammals because it... a. induces polyspermy. b. induces compaction. c. inhibits implantation of the embryo until the embryo reaches the uterus. d. inhibits the formation of twins.arrow_forwardWhich of the following is not true about avian eggs? Choose all possible answers. a. exhibit holoblastic cleavage b. first cleavages are perpendicular to the plane of the blastodisc, and approximately at right angles to one another c. at the time of the fourth cleavage, a furrow running parallel to the circumference of the blastodisc separates central from peripheral forming blastomeres. d. portion of the undersurface of the blastoderm that is farthest from the source of gravity becomes the anterior end of the embryo. e. All of the following are true about eggs of frogs.arrow_forwardInternal and external fertilization differ in that species thata. produce an amniotic egg have internal fertilization.b. without an amniotic egg have external fertilization.c. produce live young have mammary glands.d. lay eggs are external fertilizersarrow_forward
- Researchers searched for an activator of neural tissue formation. What is the real pathway for this developmental phenomenon? a. Neural tissue formation occurs via BMP inhibition by proteins secreted from the organizer. b. Noggin activates ectoderm to become neural tissue. c. Nodal activation induces mesoderm to make neural tissue. d. Beta-catenin is required for formation of neural tissue.arrow_forwardIf a Drosophila larva is missing much of its posterior end it is likely due to a mutation che: A. maternal bicoid gene. B. zygotic bicoid gene. C. maternal nanos gene. D. zygotic nanos gene.arrow_forwardWhich of the following statements about gastrulation is correct? A. During gastrulation, the contents of cell nuclei begin to vary so that they can start to perform different fucntions. B. During gastrulation, cells differentiate so that they can start to perform different functions. C. The formation of the endoderm, mesoderm, and ectoderm occurs after gastrulation. D. The formation of the endoderm, mesoderm, and ectoderm occurs before gastrulation.arrow_forward
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