CAMPBELL BIO 101 YTC W/MASTBIO >IC<
3rd Edition
ISBN: 9781323002353
Author: Reece
Publisher: PEARSON C
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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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Students have asked these similar questions
In animals, a key difference between spermatogenesis andoogenesis is thata. only oogenesis involves meiosis.b. only spermatogenesis involves meiosis.c. spermatogenesis produces four sperm, whereas oogenesisproduces only one egg cell.d. None of the above describes a difference between the twoprocesses.
All of the following are true about humans EXCEPT:
A. our zygote and early embryo cells have indeterminate cleavage
B. Our blastopore becomes our mouth
C. We are eumetazoan triploblastic bilateral deuterostomes
D. our early embryo cells are sort of radially arranged but with rotational cleavage
From which of the following is the embryo developed?
a) Trophoblasts
b) Blastocoelen
c) The yellow sacks
d) Inner cell mass
Chapter 47 Solutions
CAMPBELL BIO 101 YTC W/MASTBIO >IC<
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 - Prob. 47.2CRCh. 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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- Put these human developmental events in order, from earliest to latest a. blastocyst forms d. implantation b. heart begins beating e. breathing practice begins c. gastrulation f. neural tube formsarrow_forwardIf 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 embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________. a. the blastula stage b. the germ layer stage c. the gastrula stage d. the organogenesis stagearrow_forward
- Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The trophoblast is a germ layer. c. The inner cell mass is a source of embryonic stem cells. d. The blastula is often a hollow ball of cells.arrow_forwardA preembryo has:- a. A neural tube. b. A heart bulge. c. A cytotrophoblast. d. A coelom. e. decidual cellsarrow_forwardIf you observed fruit flies with the following developmental abnormalities, would you guess that a mutation has occurred in a segmentation gene or a homeotic gene? Explain your guess. A. Three abdominal segments were missing. B. One abdominal segment had legs. C. A fly with the correct number of segments had two additional thoracic segments and two fewer abdominal segments.arrow_forward
- Internal 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_forwardInto which structures do the trophoblast cells of the developing embryo, differentiate? a) The developing foetus b) The yolk sac c) The placenta d) The blood vessels e) All of the abovearrow_forwardThe evolution / development of the skeletal system of the vertebrate is an example of the process of cellular specialization. This refers to the fact? a) all the ectoderm cells remain the same b) the cells derived from the endoderm to form osteocytes that secrete collagen c) the cells of the endoderm form chondrocytes that become notochord d) genes are activated or surpressed in the cells from the original mesoderm causing them to become chondrocytes and osteocytes the stem cells that sequentially produce the componets of the skeleton e) genes are not involved in this function?arrow_forward
- THE FATE OF THE 1ST OPENING IN THE PROTOSOMES AND THE 2ND OPENING IN THE DEUTEROSTOMES IS DETERMINED BY? A) CHONDROCYTES B) OSTEOCYTES C) NEUROCYTES D) MYOCYTES E) MESODERMarrow_forwardIn organisms such as the chick, in which the egg has extensive yolk, the eggA. shows complete cleavage.B. shows incomplete cleavage.C. forms a blastoderm but no blastocoel.D. shows even distribution of the yolk.E. fails to synthesize DNA during cleavage.arrow_forward1. 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 can form a complete embryo if isolated. e. the gray crescent divides the dorsal-ventral axis into new cells.arrow_forward
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