Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 50, Problem 2TYK
Summary Introduction
Introduction:
A zygote undergoes mitotic divisions to form an embryo. These divisions follow specific patterns. Mitosis is a type of cell division that results in the formation of two daughter cells from a parent cell. The daughter cells formed have the same number and kind of nuclei. It is also called an equational type of cell division.
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At fertilization, a sperm contributes
a.
a diploid nucleus.
b.
mRNAs.
c.
a centrosome.
d.
nutrients.
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 occur
One day while walking across campus, you see a female butterfly laying fertilized eggs, as shown in the image below:
1. When the female butterfly’s eggs are fertilized, the fusion (2N) nucleus will divide repeatedly giving rise to cleavage nuclei, which:
a. can become trophocytes that migrate into the germarium and connect to the developing embryo by nutritive cords.
b. can migrate to the periplasm and become cleavage cells that ultimately give rise to the germ band and the serosa.
c. can migrate to the peripheral cytoplasm and become germ cells, which eventually move into the forming gonads and become oogonia or spermatogonia.
d. can remain in the yolk and become vitellophages that digest the yolk and make nutrients available to the forming embryo.
e. only b and c
f. only a and d
g. all except a
h. all except d
2. In the mature, unfertilized egg of the adult female butterfly:
a. bicoid mRNAs will congregate at the end of the…
Chapter 50 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 50.1 - Prob. 1SBCh. 50.1 - Prob. 2SBCh. 50.2 - Prob. 1SBCh. 50.2 - Prob. 2SBCh. 50.2 - Prob. 3SBCh. 50.3 - Prob. 1SBCh. 50.3 - Prob. 2SBCh. 50.4 - Prob. 1SBCh. 50.4 - Prob. 2SBCh. 50.5 - Prob. 1SB
Ch. 50.5 - Prob. 2SBCh. 50.5 - Prob. 3SBCh. 50 - Prob. 1TYKCh. 50 - Prob. 2TYKCh. 50 - Prob. 3TYKCh. 50 - Prob. 4TYKCh. 50 - Prob. 5TYKCh. 50 - Prob. 6TYKCh. 50 - Prob. 7TYKCh. 50 - In the development of the female sex organs: a....Ch. 50 - In the embryonic development of the eye: a. the...Ch. 50 - Prob. 10TYKCh. 50 - Discuss Concepts Experimentally, it is possible to...Ch. 50 - Discuss Concepts Developmental biologist Lewis...Ch. 50 - Discuss Concepts Arguably, in sexually reproducing...Ch. 50 - Prob. 14TYKCh. 50 - Prob. 15TYKCh. 50 - Prob. 16TYKCh. 50 - Prob. 1ITDCh. 50 - Prob. 2ITDCh. 50 - Prob. 3ITDCh. 50 - Prob. 4ITD
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- In humans, sexual reproduction that produces an embryo, which then develops into a fetus, requires: a. Neither mitosis or meiosis b. Mitosis c. Both mitosis and meiosisarrow_forwardDuring cleavage, the mass of cells: a. increases b. decreases c. doubles with every cell division d. does not change significantlyarrow_forwardChoose the best Following fertilization, the somatic cells of humans divide by:a. apoptosis c. mitosisb. meiosis d. DNA replicationarrow_forward
- Which 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_forwardMitosis occurs in which of the following situations? (select ALL that apply) A. Yeast cells reproducing asexually B. Certain plants that reproduce asexually C. Human adults who have stopped growing taller. D. The production of gamete cells E. Young multicellular organisms growing larger (normal growth) F. The development of a zygote after fertilization has occurred.arrow_forwardCleavage... A. Is a developmental stage consisting of a cell layer surrounding a fluid-filled space B. Is a specialized form of cell division that partitions the cytoplasm of a fertilized egg C. Refers to the fusion of haploid gametes to give a diploid zygote D. Produces an embryo with either two or three distinct cell layers E. None of the abovearrow_forward
- The expression of homeotic genes leads to a. the establishment of body axes. b. the formation of segments in the embryo. c. the determination of structures within segments. d. cell differentiation.arrow_forwardWhich of the following stages of the fertilization process stimulates completion of meiosis II in the oocyte’s nucleus? A. The sperm nucleus and egg nucleus combine to form the genetic material of the zygote B. Sperm release enzymes to digest the protein layer of the secondary oocyte C. The entry of a sperm into the secondary oocyte D. The swimming of sperm from the vagina, through the uterus, and up to an oviductarrow_forwardWhich of the following plays the greatest role in determining how cytoplasmic division occurs during cleavage? a. Number of chromosomes b. Amount of yolk c. Orientation of the vegetal pole d. Sex of the zygotearrow_forward
- 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 abovearrow_forwardOf the following cell types, which one would be most likely to exist in the G0 state? A. An epithelial cell in the intestine of a developing embryo B. A primary spermatocyte C. An intestinal epithelial cell line growing rapidly in a cell culture dish D. A differentiated intestinal epithelial cell in an adultarrow_forwardWhat is the importance and application of mitosis and meiosis in each of the following topics? a. Formation of reproductive organs b. Replacement of dead/worn out cells c. Cell repair d. Growth and development e. Regenerationarrow_forward
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY