3. Fertilization of the egg in the upper part of the oviduct has álways thought to Be a meansless fit, unable to complete the journey. However, recent evidence has showed that sperm actually 'help' each other during the ascent by lockingand pulling other sperm along towards the egg. Describe an alternative hypothesis for fertilization in the upper oviduct to the 'most fit sperm'hypothesis and how would you provide evidence?4. Hormone-based birth control methods deliver synthetic versions of progesterone in high concentrations or estradiol and progesterone in highconcentrations. Propose a model as to how this action might prevent unwanted pregnancies?5. In the recent past, the placenta, which is delivered after the birth of a fetus, was discarded as invaluable. Today, millions of dollars are being grante

To prevent pregnancy there are oral contraceptive pills which are used. These piils can be used…

4. Hormone-based birth control methods deliver synthetic versions of progesterone in high concentrations or estradiol and progesterone in high concentrations. Propose a model as to how this action might prevent unwanted pregnancies?

4. Hormone-based birth control methods deliver synthetic versions of progesterone in high concentrations or estradiol and progesterone in high concentrations. Propose a model as to how this action might prevent unwanted pregnancies?

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 7TYK

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3. Fertilization of the egg in the upper part of the oviduct has álways thought to Be a means
less fit, unable to complete the journey. However, recent evidence has showed that sperm actually 'help' each other during the ascent by locking
and pulling other sperm along towards the egg. Describe an alternative hypothesis for fertilization in the upper oviduct to the 'most fit sperm'
hypothesis and how would you provide evidence?
4. Hormone-based birth control methods deliver synthetic versions of progesterone in high concentrations or estradiol and progesterone in high
concentrations. Propose a model as to how this action might prevent unwanted pregnancies?
5. In the recent past, the placenta, which is delivered after the birth of a fetus, was discarded as invaluable. Today, millions of dollars are being grante

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A babys gender is determined at conception, and the different genitalia of male and female fetuses develop from the same tissues in the embryo. View this animation (http://openstaxcollege.org/l/fetus) that compares the development of structures of the female and male reproductive systems in a growing fetus. Where are the testes located for most of gestational time?
12.Place the following events of the acrosomal reaction in the correct chronological order. (1) The acrosome releases hydrolytic enzymes. (2) Sperm-binding proteins on the membrane bind the sperm. (3) Sperm nucleus enters the egg. (4) Sperm and egg plasma membranes fuse. (5) Sperm contacts the egg's jelly coat (This is a multiple choice question choose the answer from the choices below) A.1,2,4,3,5 B.3,5,2,1,4 C.5,2,4,3,1 D.5,1,2,4,3
12.Place the following events of the acrosomal reaction in the correct chronological order.(This is a multiple choice question choose the answer from the choices below) choose the best answer. Thank you! (1) The acrosome releases hydrolytic enzymes. (2) Sperm-binding proteins on the membrane bind the sperm. (3) Sperm nucleus enters the egg. (4) Sperm and egg plasma membranes fuse. (5) Sperm contacts the egg's jelly coat A.1,2,4,3,5 B.3,5,2,1,4 C.5,1,2,4,3
1. Briefly describe follicular development during the human ovarian cycle and how this is coordinated with the uterine cycle. 2. What assumptions are made if the number of CL is used as an indicator of reproductive rate? 3. What do you think would happen to a CL in a species that exhibits diapause (consult your textbook on this)? 4. Where are sperm made (be specific here) and what glands are important for making seminal fluid? 5. Why do the sperm “cork-screw” while swimming? 6. The menstrual cycle provides an example of how endocrine biological clocks regulate reproduction. Can you give TWO other examples?
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? The Sperm would not be able to break through the protective coat on the eggle egg (zona pellucida)." meaning the Sperm are unable to fertilize anegy. 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. 5. 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.
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
5. Explain the presence of numerous mitochondria in the sperm 6. What adaptations do sperm posess for fertilozation? 7. How is the uterus structurally adapted for holding a developing baby? 8. What happens when the egg is not fertilized?
16. Cryptorchidism is the failure of one or both of the testes to descend from the abdominal cavity into the scrotum during human fetal development. Sterility results if both testes fail to descend. In this case, the likely cause of sterility is that A. lack of oxygen inhibits testosterone function B. gonadotropic hormones cannot stimulate the testes C. the testes are not connected to the external environment normal sperm do not readily develop at body temperature D.
21.What is external to and between the seminiferous tubules and release testosterone in response to gonadotropin LH? 22.How does the brain and gonad related to each other as they function? 23.How are sperm produced? 24.A pluripotent stem cell can become any type of cell in the human body. Explain please.
8. Compare and contrast animals with external fertilization to those with internal fertilization. What structures and/or behaviors would you expect to find in each type? What are the difference(s) in gamete production between the two types?
7. Trace the pathway taken by the oocyte from its release from the ovary to its implantation site to the uterus. 8. What is spermatogenesis? Illustrate spermatogenesis 9. Discuss aortic valve and the Discuss pulmonary vavle 10. Trace the circulatory pathway. Assume that the blood is about to leave the right atrium
13.Which of the following statements is TRUE about corpus luteum?(This is a multiple choice question choose the answer from the choices below) A.Secretions of the corpus luteum prepare the uterus for the shredding of endometrium lining. B.Secretions of the corpus luteum induce maturation of primary oocytes. C.Secretions of the corpus luteum prepare the uterus for implantation of the embryo. D.The major hormone secreted from the corpus luteum is LH.