EBK HUMAN BIOLOGY
11th Edition
ISBN: 8220100545931
Author: MCMILLAN
Publisher: Cengage Learning US
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Textbook Question
Chapter 16, Problem 8SQ
Fertilization _____.
- a. unites the nuclei of a sperm and egg cell
- b. forms a zygote that has chromosomes of both parents
- c. usually occurs in an oviduct
- d. all of the above
- e. a and b but not c
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Gastrulation...
A. Is a specialized form of cell division that partitions the cytoplasm of a fertilized egg
B. Refers to the fusion of haploid gametes to give a diploid zygote
C. Produces an embryo with either two or three distinct cell layers
D. Is a developmental stage consisting of a cell layer surrounding a fluid-filled space
E. None of the above
During gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the three primary germ layers. a. notochord b. hypoblast c. epiblast d. mesoblast
Somites
a. begin forming at the tail end of the embryo and then move forward in a wavelike fashion.
b. are derived from endoderm.
c. develop into only one type of tissue per somite.
d. may vary in number from one species to the next.
Chapter 16 Solutions
EBK HUMAN BIOLOGY
Ch. 16 - Distinguish between: a. seminiferous tubule and...Ch. 16 - Which hormones influence the development of sperm?Ch. 16 - Which hormones influence the menstrual and ovarian...Ch. 16 - List four events that are triggered by the surge...Ch. 16 - What changes occur in the endometrium during the...Ch. 16 - Label the parts of the female reproductive system...Ch. 16 - Label the parts of the male reproductive system...Ch. 16 - Which oocyte stage is ovulated? What happens to it...Ch. 16 - Besides producing gametes (sperm and eggs), the...Ch. 16 - _____ production is continuous from puberty onward...
Ch. 16 - The secretion of _____ controls the formation of...Ch. 16 - During the menstrual cycle, a midcycle surge of...Ch. 16 - Ovulation releases _________. a. the corpus luteum...Ch. 16 - Which is the correct order for one turn of the...Ch. 16 - In order for sexual intercourse to produce a...Ch. 16 - Fertilization _____. a. unites the nuclei of a...Ch. 16 - Fertility specialists may advise a couple who wish...Ch. 16 - In the fertility awareness method of birth...Ch. 16 - Premenstrual syndrome (PMS) can include mood...Ch. 16 - Prob. 4CTCh. 16 - Prob. 5CT
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- 1 3. 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? 5. The Sperm would not be able to break through the protective coat on the egg (zona pellucida). meaning the sperm are unable to fertilize anegg 4. The morula contributes to a layer that becomes the embryo and to cells that become the placenta. What are the names of these structures? Illustrate and label these layers/structures. 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? 6. Explain the origins of the blastocyst cavity and what purpose does it serve? 7. Describe implantation of a blastocyst using simple, labeled diagrams.arrow_forwardCleavage... A. Is a developmental stage consisting of a cell layer surrounding a fluid-filled space B. Is a specialized form of cell division that partitions the cytoplasm of a fertilized egg C. Refers to the fusion of haploid gametes to give a diploid zygote D. Produces an embryo with either two or three distinct cell layers E. None of the abovearrow_forwardwhich of the following does not aid the sperm in fertilization? a. hyaluronidase & protease b. flagellum development c. increase mitochondria d. acrosomes e. cytoplasmic bridgearrow_forward
- . from each parent fuse to produce a new cell is the process whereby A. Gametogenesis, fertilization B. Fertilization, two cells (2n) C. Oogenesis, chromosomes D. Spermatogenesis, chromosomes E. Fertilization, gametes 24.arrow_forwardInternal fertilizationa. can prevent the drying out of gametes and zygotes.b. must take place on land.c. is practiced by humans.d. requires that males have a penis.e. Both a and c are correct.arrow_forwardWithout SRY expression, an embryo will develop ________.a. male reproductive structuresb. female reproductive structuresc. no reproductive structuresd. male reproductive structures 50 percent of thetime and female reproductive structures 50percent of the timearrow_forward
- The cells of the embryoblast differentiate into the ______ andthe ______.a. epiblast, hypoblastb. cytotrophoblast, syncytiotrophoblastc. amnioblast, epiblastd. epiblast, cytotrophoblastarrow_forwardOnly one sperm enters an egg becausea. sperm have an acrosome.b. the corona radiata gets larger.c. changes occur in the zona pellucida.d. the cytoplasm hardens.e. All of these are correct.arrow_forwardExternal fertilization occurs in which type of environment? a. aquatic b. forested c. savanna d. steppearrow_forward
- Which of the following does NOT aid the sperm in fertilization? a. increased mitochondria b. flageullum development c. cytoplasmic bridge d. hyaluronidase and protease e. acrosomesarrow_forwardThe cells that give rise to gametesa. are derived from the mesoderm.b. often arise independently from the three germ layers.c. originate directly from the tissue that will develop into thegonads.d. are some of the last cells of the embryo to differentiate.e. are formed the same way in all animals.arrow_forwardWhich of the following will result in identical twins?a. fertilization of two eggs by two different spermb. division of a zygote into two masses before differentiation has begunc. fertilization of two eggs by the same spermd. fertilization of one egg by two different spermarrow_forward
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