BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 32, Problem 1A
The following diagram is of the blastopore sage of embryonic development. Based on the information in the diagram which of the following statements is correct?
a. Most animals exhibit this pattern of development.
b. It would have formed by spiralian cleavage.
c. It would exhibit determinate development.
d. All of the choices are correct.
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Which 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.
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.
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
Chapter 32 Solutions
BIOLOGY
Ch. 32.1 - Prob. 1LOCh. 32.2 - Prob. 1LOCh. 32.2 - Prob. 2LOCh. 32.2 - Prob. 3LOCh. 32.3 - Prob. 1LOCh. 32.3 - Prob. 2LOCh. 32.3 - Prob. 3LOCh. 32.4 - Prob. 1LOCh. 32.4 - Prob. 2LOCh. 32.5 - Prob. 1LO
Ch. 32.5 - Prob. 2LOCh. 32.5 - Prob. 3LOCh. 32.6 - Prob. 1LOCh. 32.6 - Prob. 2LOCh. 32 - Prob. 1IQCh. 32 - Prob. 1UCh. 32 - Animals are unique in the fact that they possess...Ch. 32 - In animal sexual reproduction the gametes are...Ch. 32 - The evolution of bilateral symmetry was a...Ch. 32 - A fluid-filled cavity that develops completely...Ch. 32 - Which of the following statements is NOT true...Ch. 32 - Which of the following characteristics is used to...Ch. 32 - With regard to classification of animals, the...Ch. 32 - The coelom a. is a synapomorphy for the clade...Ch. 32 - A coelomate organism may have which of the...Ch. 32 - Which of the following cell types of a sponge...Ch. 32 - Prob. 12UCh. 32 - Prob. 13UCh. 32 - The following diagram is of the blastopore sage of...Ch. 32 - Prob. 2ACh. 32 - Prob. 3ACh. 32 - Which of the following cell layers is not...Ch. 32 - Prob. 2S
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- In 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_forwardWhich 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.arrow_forwardUsing the following list, describe the proper sequence for the events of animal development: 1. Tissues, organs, and other body structures in each segment are formed. 2. Axes of the entire animal are determined. 3. Cells become differentiated. 4. The entire animal is divided into segments. a. 2, 3, 4, 1 b. 1, 2, 4, 3 c. 2, 4, 3, 1 d. 3, 2, 4, 1 e. 2, 4, 1, 3arrow_forward
- 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_forwardWhich of the following statements is TRUE? A. Animals with indirect development requires external fertilization and an aquatic environment B. Protandry refers to species that begins life as male but later on transforms into females C. Parthenogenesis is a form of sexual reproduction di D. Animals may reproduce either sexually or asexually but never botharrow_forwardThe development of a zygote into a baby involves pre-embryonic development for the first 2 weeks, followed by embryonic development for the next 6 weeks, and finally fetal development until the baby is born. When is the developing baby considered a fetus? Select one: a. When all major organ systems have formed b. After the neural tube forms c. Once gastrulation is complete d. When most major organ systems have formed; the neural system forms during the fetal stagearrow_forward
- 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.arrow_forwardWhich of the following is the correct order for the four developmental phases in animals? A. Segmentation of the body B. Determination C. Cell differentiation D. Formation of body axes a. A, B, C, D b. A, D, C, B c. D, A, B, C d. D, A, C, Barrow_forwardWhich of the following correctly identifies the stages in embryonic development between weeks 2 and 8? Select one: a. Formation of placenta → neurulation → organ formation → gastrulation b. Gastrulation → organ formation → neurulation → formation of placenta c. Gastrulation → neurulation and placental formation → organ formation d. Formation of placenta → gastrulation → organ formation → neurulationarrow_forward
- What are the correct pairings of developing and embryonic structures in the gastrulation of chickens? Multiple answers is possible. If no correct option is given write the proper pairings. a. Epiblast – ectoderm b. Secondary hypoblast – endoderm c. Primary hypoblast – endoderm d. Migrating cells - mesodermarrow_forwardScientists compare the structures of a chicken embryo and a human embryo at the same stage of development. They find that both vertebrates have similar shapes and structures, including the presence of gill slits and tails. How is this comparison of the embryos used as supporting evidence of evolution? A. The similarities suggest that chickens and humans are the direct descendants of modern day fish with tails and gill slits. B. The similarities suggest that vertebrates passthrough each of the adult stages of their evoluntionary history as they develop. C. The similarities suggest that vertebrates can undergo genetic changes during development that lead to the evolution of new species D. The similarities suggest that chickens and humans descend from ancestors with genes that code for the development of tails and gill slitsarrow_forwardSea 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_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