Let's say that the an experiment is planned to test the following hypothesis:Sea urchin fertilization will go down as temperature risesWhat will be the independent & dependent variables in this experiment?

1. Dependent variable - a. a Number of urchins used b. Concentration of Carbon dioxide c.…

Answered: What will be the independent &…

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter7: Development And Sex Determination

Section: Chapter Questions

Problem 5QP

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Which of the following is TRUE about neurulation? (Check all that apply) A The detail mechanism varies slightly be species. It involves some of the morphogenetic movements that also operate in gastrulation. C It corresponds to the physical and functional segregation of the neural tube into brain and spinal cord. D It proceeds in a posterior to anterior order. It overlaps in time with gastrulation. F Depending on the cellular processes involved, neurulation can be regarded as primary, secondary or tertiary. It corresponds to the physical and functional segregation of the ectoderm into epidermis, neural tube and neural crest. It is the segmentation of the mesoderm into somites. It is the segregation of early embryonic cells into the three germ layers: ectoderm, mesoderm and endoderm. It is the segregation of mesodermal cells into myogenic lineage and skeletogenic lineage. E Feedback That's not correct
QUESTION 3 Which of the following statements is true regardng neurulation? The notocord is formed from ectoderm The notochors is present throughout development and disappears after birth The notochord produces signals that induce neural plate formation The notochord produces signals that induce neural tube formation
Which of the following is not an important component of the slow block to polyspermy Group of answer choices A. depolarization of the cell B. a physical space between the cell membrane and the fertilization envelope C. hardening of the vitelline layer and jelly coat to form the fertilization envelope
In the early 2000s, scientists have determined that the nation's top-selling weed killer, atrazine, disrupts the sexual development of frogs at concentrations 30 times lower than levels allowed by the Environmental Protection Agency (EPA), raising concerns about heavy use of the herbicide on corn, soybeans and other crops in the Midwest and around the world. The amphibians (the frogs) are exposed to atrazine when in water. [atrazine frog Given that log Kow for atrazine is 2.65 and that log 0.85 log Kow - 0.07. %3D [atrazine]pater If the atrazine concentration in the water is 100 ng/L, what would be the concentration of atrazine in frogs in ppm?
1. There are many pathways in fertilization that remain as gray areas. Choose one of these pathways and visually show where the "unknown" lies. Example: The Izumo-Juno/CD9 complex is responsible for sperm to bind with the egg prior to its penetration. The IP3 pathway is responsible for cytosolic Ca+2 to increase in concentration, promoting the polyspermy block and egg activation that precedes amphimixis. What signaling pathway is activated by the Izumo-Juno/CD9 complex formation that will in turn activate the IP3 pathway?
Give typing answer with explanation and conclusion to all parts
In vitro fertilization (IVF) is a common assistive reproductive technology for couples who are struggling to conceive naturally; however, the success rate of IVF is, at best, about 55%. Researchers seeking to improve the success of IVF need to observe the interaction between sperm and eggs in order to better understand the factors that favour fertilization. Obviously, larger sperm and eggs would be easier to observe, even with the aid of microscopy. On this basis, which of the following vertebrate groups might be a good model for studying IVF because they are likely contain species with large sperm and eggs? Group of answer choices a) fish b) amphibians c) reptiles d) birds e) mammals
QUESTION 1 Which of the following are not hormonally controlled examples of parental investment in offspring? • Vitellogenin production • Encapsulation of egg production in a place separate from sperm production. • The emotional bond between parents and offspring in mammals. • Yolk production • Parents feeding hatchling birds
What, if anything, does this experiment indicate about the validity of the pangenesis and the germ-plasm theories
10. Researchers have discovered a new compound that is a candidate for birth control. Its proposed mechanism is to be a progesterone receptor agonist meaning that it binds and activates receptors that would normally recognize progesterone. Researchers are interested in understanding the efficacy of the new compound, in other words, how well does its progesterone receptor agonist activity prevent the possibility of pregnancy. Assume that we are working in a rodent model system (mouse or rat) and propose a research design to test the efficacy of this compound. This design needs to address the proposed mechanism that this compound is a progesterone receptor agonist. Include a description of the variables in the experiment, the treatment groups, the procedure to detect the efficacy of the proposed mechanism, and an explanation of the results that would be required to confirm the efficacy of this compound for birth control. D. Focus 五

QUESTION 3 Which of the following is the correct comparision of fertilization in sea urchins and mammals? Both sea urchin and mammalian embryos use membrane depolarization as a fast block to polyspermy O Cleavage occurs before fertilization in sea urchins, but after fertilization in mammals Sea urchin embryos first undergo cell division about 24 hours after fertilization while mammalian embryos undergo cell division 90 minutes after fertilization Sea urchin embryos have a jelly coat while mammalian embryos have a zona pellucida
Which of the following is NOT true while comparing internal to external fertilization. In external fertilization, zygotic DNA replication starts after the fusion of gamete pronuclei; in internal fertilization, the first zygotic DNA synthesis happens before pronuclei fusion. B Capacitation is only observed in internal fertilization. In both internal and external fertilization, the cortical granule reaction is required for the slow block to polyspermy. In external fertilization, intracellular calcium release is stimulated prior to gametes fusion; in internal fertilization, it happens after gametes fusion. In both internal and external fertilization, there is a slow and a fast block to polyspermy.

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