Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 43, Problem 27RQ
Which of the following is false?
- The endoderm, mesoderm, ectoderm are germ layers
- The trophoblast is a germ layer
- The inner cell mass is a source of embryonic stem cells
- The blastula is often a hollow ball of cells.
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What is NOT a disadvantage of internal fertilization?
the ability to reproduce on land without needing external water
the need for more specialized reproductive structures
the production of fewer embryos
the reduction in the randomness of fertilization (less genetic variability in offspring)
Lacking genetic variants, how would you determine whether the worms can self-fertilize?
Rank the steps from first to last. To rank items as equivalent, overlap them.
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Worms are raised apart
Cells outside the gonads contain
five chromosome pairs.
Offspring produces oocytes and
Eggs develop into worms.
from one another.
sperm.
Individual eggs are collected.
First step
Last step
Which statement below concerning oogenesis is FALSE?
About half the oogonia complete mitosis between birth and puberty.
An ovum completes its last meiosis after it is fertilized.
At birth, girls have already lost the majority of their oocytes.
oogenesis begins before birth.
OOva develop from stem cells called oogonia.
Chapter 43 Solutions
Biology 2e
Ch. 43 - Figure 43.8 Which of the following statements...Ch. 43 - Figure 43.15 Which of the following statements...Ch. 43 - Figure 43.17 Which of the following statements...Ch. 43 - Which form of reproduction is thought to be best...Ch. 43 - Which form of reproduction can result from damage...Ch. 43 - Which form of reproduction is useful to an animal...Ch. 43 - Genetically unique individuals are produced...Ch. 43 - External fertilization occurs in which type of...Ch. 43 - Which term applies to egg development within the...Ch. 43 - Which term applies to egg development outside the...
Ch. 43 - Sperm are produced in the______ scrotum seminal...Ch. 43 - Most of the bulk of semen is made by the...Ch. 43 - Which of the following cells in spermatogenesis is...Ch. 43 - Which female organ has the same embryonic origin...Ch. 43 - Which female organ has an endometrial lining that...Ch. 43 - How many eggs are produced as a result of one...Ch. 43 - Which hormone causes Leydig cells to make...Ch. 43 - Which hormone causes FSH and LH to be released?...Ch. 43 - Which hormone signals ovulation? FSH LH inhibin...Ch. 43 - Which hormone causes the regrowth of the...Ch. 43 - Nutrient and waste requirements for the developing...Ch. 43 - Progesterone is made during the third trimester by...Ch. 43 - Which contraceptive method is 100 percent...Ch. 43 - Which type of short term contraceptive method is...Ch. 43 - Which hormone is primarily responsible for The...Ch. 43 - Major organs begin to develop during which part of...Ch. 43 - Which of the following is false? The endoderm,...Ch. 43 - During cleavage, the mass of cells: increases...Ch. 43 - Which of the following gives rise to the skin...Ch. 43 - The ribs form from the ___________ . notochord...Ch. 43 - Why is sexual reproduction useful if only half the...Ch. 43 - What determines which sex will result in offspring...Ch. 43 - What are the advantages and disadvantages of...Ch. 43 - Why would paired external fertilization be...Ch. 43 - Describe the phases of the human sexual response.Ch. 43 - Compare spermatogenesis and oogenesis as to timing...Ch. 43 - If male reproductive pathways are not cyclical,...Ch. 43 - Describe the events in the ovarian cycle leading...Ch. 43 - Describe the major developments during each...Ch. 43 - Describe the stages of labor.Ch. 43 - What do you think would happen if multiple sperm...Ch. 43 - Why do mammalian eggs have a small concentration...Ch. 43 - Explain how the different germ layers give rise to...Ch. 43 - Explain the role of axis formation in development.
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which of the following are mismatched? (a) endoderm; lining of the digestive tube (b) ectoderm; circulatory system (c) mesoderm; notochord (d) mesoderm; reproductive system (e) ectoderm; sense organsarrow_forwardFigure 29.22 Which of the following statements about the parts of an amniotic egg are false? The allantois stores nitrogenous waste and facilitates respiration. The chorion facilitates gas exchange. The yolk provides food for the growing embryo. The amniotic cavity is filled with albumen.arrow_forwardEndoderm Mesoderm Ectoderm Match the structures below with the correct germ layers listed above that they are formed from. Number: Answer Answer Answer Answer Tissues and Organs: Central Nervous System Lining of the Digestive Tract Skin Skeletonarrow_forward
- From which of the following is the embryo developed? Trophoblasts Inner cell mass Blastocoelen The yellow sacksarrow_forwardWhich of these becomes the gastrointestinal tract? mesoderm endoderm ectoderm all of the above none of the abovearrow_forwardWhich choice below shows a correct order of events during development? Gastrula, blastula, neural tube closure, and primary vesicle formation. Blastula, neuroepithelial cell proliferation, axonogenesis and synapse maturation. Gastrula, dendritogenesis, neural tube closure and synapse formation. Neural tube closure, notochord formation, dendritogenesis and synapse formation. Axonogenesis, neuronal migration, synapse maturation, synaptic specializationarrow_forward
- Which of the following rows correctly identifies the development of the germ layers? Select one: A. Endoderm Mesoderm Ectoderm Placenta Muscle Hair and nails B. Endoderm Mesoderm Ectoderm Stomach and intestine Lining Reproductive system Brain and Spinal Cord C. Endoderm Mesoderm Ectoderm Muscle Bones Epidermis D. Endoderm Mesoderm Ectoderm Lungs and stomach linings Heart and Lungs Liver and pancreasarrow_forwardWhich of the following follows fertilization in Xenopus embryos? Calcium waves cause non-yolky cytoplasm to squeeze into animal pole Meiosis II completes Occurs before albumen and shell are secreted to cover the egg Cortical rotation Centrally located yolk confines cleavage to cytoplasmic rim of eggarrow_forwardHow do different types of energy investment by females contribute to the reproductive success of a frog, a chicken, and human? Drag the appropriate items to their respective bins. Reset Help embryos have gelatinous coat and lack internal membranes internal fertilization external fertilization embryos have internal membrane invest energy to the protection of their embryos by strong shells invest energy to the gamete production invest energy to the protection of their embryos by internal development Frog Chicken Humanarrow_forward
- Which of the following rows correctly identifies a difference between blastocysts and morula? Select one: A. Blastocyst Morula Contains trophoblast and a zygote Contains 8 cells that are totipotent B. Blastocyst Morula Contains inner cell mass with germ layers Contains 8 cells that are totipotent C. Blastocyst Morula Contains trophoblast with germ layers Contains 16 cells that can become any cells in the human body D. Blastocyst Morula Contains trophoblast and inner cell mass Contains 16 cells that can become any cells in the human bodyarrow_forwardIdentify whether each statement is a characteristic of a plant or animal. Plant Animalarrow_forwardFrom a 24-hour chick embryo, provide the answers in the following: Pairs of somites in a 24-hour chick embryo Germ layer/s that forms the head process What begins the formation head of process Germ layer/s that form the proamnion Explain why the notochord is not visible in areas where the somites are seenarrow_forward
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