Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 39.5, Problem 1TYK
The three germ layers of triploblasts are established during
- fertilization.
- cleavage.
- blastula formation.
- gastrulation.
- neurulation.
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Fertilization is the fusion of haploid gametes, ovum and spermatozoon, to form a diploid zygote. Discuss physiologic mechanisms in the male and the female that make sure that indeed only one sperm fertilizes a single egg
There are 6 major events in fertilization. Discuss the process of fertilization or conception, with emphasis on the sperm-egg interaction.
Proteins on the sperm plasma membrane bind to ZP3 molecules within the zona pellucida of the egg. Why is this event important?
Zona binding triggers the acrosome reaction, in which the sperm plasma membrane fuses with the outer acrosomal membrane, causing exocytosis of acrosomal contents. What is in the "acrosomal content"?
Acrosomal enzymes begin to dissolve a hole in the zona pellucida. This enzymatic degradation, accompanied by rapid sperm tail beating, moves the sperm through the zona. Where does the sperm intend to reach?
Chapter 39 Solutions
Principles of Biology
Ch. 39.1 - Choose the correct statement. The majority of...Ch. 39.2 - In _________ gametes are released in large numbers...Ch. 39.2 - In which way is gametogenesis similar in males and...Ch. 39.3 - Prob. 1CCCh. 39.3 - Prob. 1TYKCh. 39.3 - Prob. 2TYKCh. 39.4 - Prob. 1BCCh. 39.4 - Prob. 2BCCh. 39.4 - Prob. 1CCCh. 39.4 - Prob. 1TYK
Ch. 39.4 - Prob. 2TYKCh. 39.5 - The three germ layers of triploblasts are...Ch. 39.5 - Choose the correct sequence of events. cleavage...Ch. 39.6 - Under what condition(s) might you expect temporary...Ch. 39.6 - Prob. 2TYKCh. 39 - Prob. 1TYCh. 39 - Prob. 2TYCh. 39 - Spermatogonia are haploid germ cells. d. have...Ch. 39 - Prob. 4TYCh. 39 - Prob. 5TYCh. 39 - Prob. 6TYCh. 39 - A major function of FSH is to stimulate the...Ch. 39 - Prob. 8TYCh. 39 - Prob. 9TYCh. 39 - Cells of the neural crest give rise to the central...Ch. 39 - Prob. 1CCQCh. 39 - Prob. 2CCQCh. 39 - Prob. 3CCQCh. 39 - Describe the major events in animal development...Ch. 39 - Describe the events of the ovarian and uterine...
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- Which of the following statements concerning oogenesis is false? Oogenesis begins before birth. Ova develop from stem cells called oogonia. An ovum completes meiosis II after it is fertilized. About half the oogonia complete mitosis between birth and puberty. By the time of their birth, girls have already lost about 80 percent of their oocytes.arrow_forwardWhy is the ovum so much bigger than a sperm cell? 1)It already contains all the chromosomes that will determine the zygote's traits. 2)It must store enough food for the growth of the zygote into an embryo. 3)Its big size allows the sperm to locate it better inside the oviduct. 4)A big ega is easier to implant in the uterus after tertilization.arrow_forwardARRANGE THE FOLLOWING EVENTS IN CORRECT SEQUENCE from 1-13: Penetration of the zona pellucida Cortical reaction 1st cleavage Acrosomal membranes rupture, and release their enzyme contents Penetration of the corona radiata Depolarization of egg membranes Migration of cortical cytoplasm to form gray crescent Sperm attach loosely on the zona pellucida Zona reaction Oocyte completes meiotic division ZP3 tenaciously binds acrosome-intact sperm Release of Ca+2 in egg cytoplasm from its bound state Amphimixisarrow_forward
- Which plane would be helpful when viewing the heart and the right kidney at the same time? whychose that plane and why the remaining planes would not be helpful when viewing these specific organs at the same time. Enzymes are important during the process of fertilization. What would be the anticipated consequences if the level of acrosin was low or non-existent in the acrosome? What is the name of the outer cell layer of the blastocyst and what does it give rise to? Does this layer contribute to the development of the embryo?arrow_forwardFrom which of the following is the embryo developed? Trophoblasts Inner cell mass Blastocoelen The yellow sacksarrow_forwardWhere (specifically) does fertilization take place in the body? When the zygote divides, is it using meiosis or mitosis?arrow_forward
- The liberation of egg from the ovary occurs in primary oocyte stage. True/Falsearrow_forwardAll of the following are requirements for successful external fertilization except for one. Which one is not a requirement? A moist environment. Large, energy-rich gametes. Synchronization of gamete release. Lock and key recognition between gametes of the same species.arrow_forwardWhich 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.arrow_forward
- At what point in embryonic development does the gonadal ridge no longer exhibit bipotential? 1) week 6 2) week 7 3) week 10 4) week 12 no references, just homeworkarrow_forwardWhich of the following does NOT aid the sperm in fertilization? * Increased mitochondria Cytoplasmic bridge Acrosomes Flagellum development Hyaluronidase & proteasearrow_forwardGive the function/purpose of the following terms: germ layers ectoderm mesoderm endoderm blastocyst yolk sacarrow_forward
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