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, thefirst 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, ithappens after gametes fusion.In both internal and external fertilization, there is a slow and a fast block to polyspermy. In sea urchin, which step of egg and sperm recognition is mediated by Bindin?A) Sperm binding to the egg's vitelline membraneB) Sperm binding to the egg's jelly coatAcrosomal reactionFusion of the sperm and egg membranesChemo-attraction

Question- In sea urchin which step of egg and sperm recognition is mediated by Bindin ? Sperm…

Answered: In sea urchin, which step of egg and…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter20: The Reproductive System

Section: Chapter Questions

Problem 11RE

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Which of the following statement does NOT correctly describe the event of the following fertilization? Select one: A. As hCG takes over maintaining the endometrium immediately after implantation, the corpus luteum degenerates into the corpus albican. B. All 16 cells in a morula are truly totipotent, meaning that they can become any cells in the human body. C. The trophoblast has important in maintaining the pregnancy, as it prevents the endometrium from shedding. D. Only inner cells mass in a blastocyst is pluripotent.
Which of the following statements is TRUE of interkinesis? It is relatively brief interphase between telophase I and prophase II. Chromosomes duplicate during interkinesis DNA undergoes semiconservative replication during this interphase. In all species, chromosomes usually decondensed during this time The following are haploid cells, EXCEPT: A. Spermatids and spermatozoa C. Ovum and second polar body B. Primary oocytes and primary spermatocytes D. Secondary oocytes and first polar body Which of the following statements is INCORRECT? By six months after conception, fetal ovaries contain about half a million primary oocytes arrested in the diplotene stage. At ovulation, a released primary oocyte completes meiosis I and proceeds as far as metaphase II. Fertilization quickly completes meiosis II. Only two of the three products of a single meiosis serve as the female gametes.
A normal somatic cell in horses has 64 chromosomes. Give the number of chromosomes and number of DNA molecules that will be present in the following horse cells: spermatogonia, first polar body, primary oocyte and, secondary spermatocyte.
The change of successful fertilization is approximately 18% in every cycle. Why does this statistic seem so low? All of the following statements provide a reason as to why the chance of fertilization is 18% every ovarian cycle EXEPT Select one: A. Some Sperm cells are not very motile, while others are formed without a tail. B. If more than one sperm fertilizes an egg, multiple embryos can result. C. Vagina is very acidic, killing many sperm. D. There two fallopian tubes and two ovaries, but only one of them releases an ovum every cycle.
Which of the statements is FALSE? Somatic cells are diploid in diploid organisms. Gametes are produced from meiosis by germline cells. Somatic cells are capable of both mitosis and meiosis. Somatic cells and gametes from the same organism have different chromosomal complements.
A teratogen is an agent that produces nongenetic abnormalities during embryonic or fetal development. Suppose a teratogen is present at conception. As a result, during the first mitotic division the centromeres fail to divide. The teratogen then loses its potency and has no further effect on the embryo. What is the chromosomal complement of this embryo?
A spermatogonial cell undergoes mitosis before entering the meiotic cell cycle en route to the production of sperm. However, during mitosis the cytoplasm fails to divide, and only one daughter cell is produced. A resultant sperm eventually fertilizes a normal ovum. What is the chromosomal complement of the embryo?
In vitro fertilization (IVF) is a procedure that can help couples who are having difficulty becoming pregnant due to blocked Fallopian tubes, low sperm count, low sperm motility, or sperm that cannot penetrate the outer layer of an egg, among other conditions.Normally, an ovary produces one mature ovum per 28-day cycle. In order to ensure a successful IVF procedure, doctors try to retrieve a large number of mature eggs.In order to obtain a greater than normal number of mature eggs, doctors inject the IVF candidate with a drug such as Bravellissima, which stimulates multiple follicle development. They also administer a drug such as Centrotic, which suppresses ovulation to prevent earlier than anticipated ovulation of mature ova. Which of the following rows correctly identifies the naturally occurring hormones that the IVF drugs are imitating? Select one: a. Bravellissima Centrotic FSH Estrogen b. Bravellissima Centrotic Progesterone LH c. Bravellissima…
Mitosis happens throughout the male life cycle however, meiosis takes place only for a limited period of his life cycle. Select one: True False In a human body, kidney cells have a different DNA from the one present in the lung cells, because type does a different function. Select one: True False Mitochondria in cells of plant seeds break down starch to produce energy in the form of ATP Select one: True False When a red blood cell (RBC) is placed in distilled water it will shrink Select one: True False
Which of the following is not true about neurulation? Choose all possible answers. a. Segregation of neural ectodermal rudiment from the epidermal ectoderm. b. In primary neurulation, the neural plate thickens along its midline into a solid cord of cells that is displaced internally and cavitates to form a hollow tube. c. In secondary neurulation, the neural plate folds along the anterior-posterior axis of the embryo, forming a tube that detaches from, and is displaced under, the epidermal ectoderm. d. Ectoderm forms the neural tube e. Mesoderm forms the reproductive organs f. Endoderm forms the gut g. All are true about neurulation
In humans, gametogenesis in both sexes relies on meiosis. However, spermatogenesis produces four gametes while oogenesis produces only one. Explain why this is so, including the specific structures or processes involved.
TRUE OF FALSE Primary spermatocytes are diploid in number like spermatogonia while spermatocytes are haploid in number. Spermatogenesis is the final stage of reproductive cell division by which there is the development of haploid spermatids into sperm. Spermiation is the event by which sperm are released from their connections to Sertoli cells. Digestive secretions from the small intestine complete the digestion of carbohydrates, proteins, and lipids. Bacteria in the large intestines produce minerals and nucleic acids.

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In sea urchin, which step of egg and sperm recognition is mediated by Bindin? A) Sperm binding to the egg's vitelline membrane B) Sperm binding to the egg's jelly coat Acrosomal reaction Fusion of the sperm and egg membranes Chemo-attraction