Mature Medusa1. Look at the life cycle diagram of ajellyfish species on the right.ImmatureMedusaa) Indicate which type ofreproduction (asexual or sexual)takes place at each of the fourstages indicated on the diagram.Explain how you can tell.Fertilised Egg41Blastulab) What are the advantages of havingMedusaPlanula- BudLarvaboth asexual and sexualreproductive capabilities?c) Under which circumstances domany organisms, such as rotifersand single-celled plankton, switchfrom asexual to sexual3ColonyPolypBudPolypreproduction? Why?FrustuleBudFrustule Larva

(a) In the given diagram, there are four stages indicated in which first stage (1) shows the sexual…

Answered: Mature Medusa 1. Look at the life cycle…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter49: Animal Reproduction

Section: Chapter Questions

Problem 18TYK

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Which statements are true? Explain why or why not.1 In the early cleavage stages, when the embryocannot yet feed, the developmental program is driven andcontrolled entirely by the material deposited in the egg bythe mother.2 Because of the many later developmental trans-formations that produce the elaborately structured organs,the body plan set up during gastrulation bears little resem-blance to the body plan in the adult.3 As development progresses, individual cellsbecome more and more restricted in the range of cell typesthey can give rise to.4 At different stages of embryonic development,the same signals are used over and over again by differentcells, but with different biological outcomes.5 Changes in the coding regions of genes involved indevelopment are primarily responsible for the differencesbetween species. 6 The cell cycle is the ticking clock that sets thetempo of developmental processes, with maturationalchanges in gene expression being dependent on cell-cycleprogression.
Cleavage blastomeres are totipotent. Differentiate this property from the terms plutipotent, unipotent, multipotent. Give examples to prove your point.
A: Why do sea urchins have external fertilization? [Discuss the life style of the developing sea urchin embryo in the water column compared to a very different ecological niche of the adults on the ocean floor. Besides, would you want to give live birth to a sea urchin! ouch!] 2: Then why don't the parents take care of the young? [In fact the adults do in a way. After the embryo has grown large enough and metamorphosed into a young urchin they hide in the spines of the adults, living off of the scraps of food produced from the messy eating of the adults] 3: Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?
Why sex? The comparison of parthenogenic species with sexually reproducing species demonstrates a fundamental "cost of sex" for those sexually reproducing. Despite the significant cost, how is it that sexual production is so common. Defend your evidence with the answer?
Fluorescence Mapping of Blastomere in Sea Urchins Fate mapping is a technique that allows determination of the fate of cells from the three germ layers. In worms, the endoderm gives rise to the cells that line the intestines. The ectoderm gives rise to cells of the nervous system and body covering. The mesoderm gives rise to the muscles and other organs between the ectoderm and mesoderm. A researcher is tracing the fate of a particular cell (blastomere) from its position in one of the three germ layers of sea urchin blastulae by injecting a fluorescent tag in cells of the ectoderm, mesoderm, and endoderm. Several weeks later, the sea urchin embryos were analyzed for the presence of fluorescence in specific tissues. The following results were obtained. Tissue Percent increase fluorescence over background when dye is injected in the ectoderm Percent increase fluorescence over background when dye is injected in the mesoderm Percent increase fluorescence over background when dye is…
What are the------ a. main three differences and three similarities between gametes of frog and fish. b. different Reproductive strategies in fishes? Explain with the help of examples. c. Draw reproductive tract of hen
33 Hour Chick Embryo (See Image) What encloses the Hensen's node and the primitive pit?
Fill in the blanks. The parentheses represent choices for each blank. During human fertilization, ________ (two male gametes, two female gametes, a male gamete and a female gamete) fuse to produce a __________ (male germ cell, female germ cell, zygote).
Question:- explain the oogenesis of the PIG (FEMALE) specifically in the origin of gametes
Reproductive physiology (human) a) At the time of ovulation, the released ovum (egg) has completed both meiosis I and meiosis II. b) Because the corpus luteum (CL) is rescued from atresia by hCG early in pregnancy, the CL continues to produce progesterone throughout the 9 months of a normal pregnancy. c) Late in the follicular phase, estrogen participates in a positive feedback loop that leads to a surge in luteinizing hormone and ovulation. d) Both (a) and (b) are correct and (c) is incorrect e) Statements (a), (b) and (c) are all correct
Discuss Concepts Arguably, in sexually reproducing animals, development begins when eggs and sperm form in the parents. In a paragraph, explain the rationale for this idea.
Mammalian sperm don’t live very long after ejaculation.Therefore, for a rhino cow to become pregnant, the sperm must be placed in her vagina or uterus, whether by mating or by artificial insemination, at about the same time that ovulation occurs.The simplest way to ensure correct timing is to induce ovulation and have mating or artificial insemination the same day. How might ovulation be induced, in rhinos or in other mammals?

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