Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 51, Problem 10TY
Summary Introduction
Introduction: Embryo development is a crucial step for ensuring the survival of any species. The initial development is similar for both vertebrates and invertebrates. As the embryo continues to develop, the specific characteristics of the species start emerging at different stages. The nerve cord, notochord, postnatal tail, and pharyngeal slits are the four characteristics that are present in the chordates. The neural crest is the feature that is present in all the vertebrates such as birds, mammals, and reptiles.
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In the development of the nervous system, one of the following is false?
The neural tube maintains temporary contact with the yolk sac cavity via neuropores.
O a.
O b. The neural tube develops from ectoderm.
O c. The neural groove forms from the neural plate.
d. The neural folds are composed of neuroectoderm cells.
O e.
The ectoderm fuse to cover the neural crest & the neural tube is the surface ectoderm
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Layer A is called _____X________, and ______Y________ develops from this layer.
Select one:
a.
X
Y
Ectoderm
Nervous system
b.
X
Y
Endoderm
Nervous system
c.
X
Y
Endoderm
Lining of the digestive tract
d.
X
Y
Ectoderm
Lining of the digestive tract
What are the pathways through which a neural tube defect can occur?
Select one or more:
V A. Failure of initiation of neural tube closure
V B. Failure to fuse the elevated neural folds
V C. Abnormalities in adhesion of surface ectodermal cells
V D. Altered differentiation of neuromesodermal progenitors at the sacral level
Chapter 51 Solutions
Biology
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Ch. 51 - Prob. 4TYCh. 51 - Prob. 5TYCh. 51 - Prob. 6TYCh. 51 - A major function of FSH is to a. stimulate the...Ch. 51 - During the human ovarian cycle, ovulation is...Ch. 51 - Prob. 9TYCh. 51 - Prob. 10TYCh. 51 - Prob. 1CQCh. 51 - Prob. 2CQCh. 51 - Prob. 3CQCh. 51 - Prob. 1COQCh. 51 - Describe the events of the ovarian and uterine...
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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_forwardThe mesoderm gives rise to a. structures derived from epidermis, such as hair, feathers, nails, or claws. b. the lining of the digestive tract, pancreas, and liver. c. only the liver. d. the heart, blood vessels, muscle, and bones.arrow_forwardA. CRANIAL (CEPHALIC) NEURAL CREST B. TRUNK NEURAL CREST C. VAGAL AND SACRAL NEURAL CREST Trace their differentiation pathways from the time the precursor cells break away from the neural tube. Make sure that this three (3) derivatives utilize different migratory pathways.arrow_forward
- Which of the following is not derived from the ectoderm? a. adrenal medulla b. epidermis of skin c. liver d. nervous systemarrow_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_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_forward
- A biological hormone feedback system causes puberty to begin. What occurs during this process? A. New sex hormones are introduced into the body. B. A part of the pituitary gland shuts down in preparation for puberty. C. Levels of preexisting hormones are increased to a higher setpoint. D. All of the above.arrow_forwardEstradiol is found in high levels in the pregnant rat. This estradiol is prevented from affecting the development of the fetus because: a. it is chemically converted to testosterone, which does not affect the fetus b. it is bound by alpha-fetoprotein c. the blood-brain barrier keeps estrogens like estradiol out of the brain d. the fetus does not possess the estrogen receptors needed to respond to the estradiolarrow_forwardWhich of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veinsarrow_forward
- Somites a. begin forming at the tail end of the embryo and then move forward in a wavelike fashion. b. are derived from endoderm. c. develop into only one type of tissue per somite. d. may vary in number from one species to the next.arrow_forwardAlong the notochord, segmented blocks of tissue that give rise to muscles, vertebrae, and connective tissues are calleda. neural crests.b. morulas.c. primitive streaks.d. somitesarrow_forwardSomites develop froma. paraxial mesoderm.b. intermediate mesoderm.c. lateral plate mesoderm.d. head mesenchymearrow_forward
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