Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Chapter 18, Problem 14CTQ
Compared to separate sexes and assuming self-fertilizing is not possible, what might be one advantage and one disadvantage to hermaphroditism?
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Chapter 18 Solutions
Concepts of Biology
Ch. 18 - Figure 18.12 Which of the following statements...Ch. 18 - Figure 18.17 Which of the following statements...Ch. 18 - In which group is parthenogenesis a normal event?...Ch. 18 - Genetically unique individuals are produced...Ch. 18 - External fertilization occurs in which type of...Ch. 18 - The process of gastrulation forms the _______. a....Ch. 18 - Which of the following gives rise to the skin...Ch. 18 - Sperm are produced in the _______. a. scrotum b....Ch. 18 - Which female organ has an endometrial lining that...Ch. 18 - Which hormone causes FSH and LH to be released? a....
Ch. 18 - Nutrient and waste requirements for the developing...Ch. 18 - Which hormone is primarily responsible for the...Ch. 18 - What might be a disadvantage to...Ch. 18 - Compared to separate sexes and assuming...Ch. 18 - What do you think would happen if multiple sperm...Ch. 18 - Compare spermatogenesis and oogenesis as to timing...Ch. 18 - Describe the events in the ovarian cycle leading...Ch. 18 - Describe the stages of labor.
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- 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.arrow_forwardFertilization 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 eggarrow_forwardAlthough the most effective form of an oral contraceptive for woman contain estrogen and progestin, some birth control pills contain a small dose of progestin-only. This is because there are many risks and side effects. Which of the following statements is NOT a reason for using a progestin-only oral contraceptive? Select one: A. progesterone maintains the corpus luteum as corpus luteum release a large amount of progesterone and estrogen. B. progesterone suppresses the maturation of follicles, thereby preventing ovulation of a mature ovum. C. progestin-only oral contraceptives prevent the production of FSH and LH in the anterior pituitary. D. progesterone suppresses the production of GnRH in the hypothalamus.arrow_forward
- Which of the following is true regarding the determinants of sexual development: the presence of the gene for HY antigen on the Y chromosome determines whether a testis develops from the gonadal ridge. the presence of MIS determines whether the Wolffian ducts develop. the presence of estrogen determines whether a vagina develops. the presence of DHT determines whether a prostate develops.arrow_forwardDescribe what sexual dimorphism is and why its existence is puzzling.arrow_forwardWhat is Asexual reproduction? Explain kindlyarrow_forward
- Which of the following describes the role of Luteinizing hormone in the ovarian cycle? o Inhibits the hypothalamus from secreting GNRH o Directly promotes thickening of the endometrium o Simulates the ovary to increase aldosterone o Induces the corpus luteum to secrete progesterone Stimulates lactation in the mammary glandsarrow_forwardWhat are the general characteristics of sexual reproduction in humans and other vertebrates that are associated with continuous production of many sperm cells but intermittent, finite production of egg cells?arrow_forwardSome animals like Aphids, sea anemones, starfishes, sea stars can reproduceasexually and sexually. What will be the advantage and disadvantage ofproducing through asexual and asexual method?arrow_forward
- After learning about the reproductive systems, how would advise a couple with following concern: "If we do not want a baby for next two years, how can we calculate the safe sex period?" She shares that her cycle is regular but not standard 28 days long cycle (so the standard explanation form different sources won't work unless you think critically)! At what time of the female cycle is she most likely to prevent fertilization of her ovulated egg? Consider the fact that her cycle is not 28 days but longer or shorter (you pick). Do males have any time (in their cycle- if any) when their gametes would not be able to fertilize the egg? In other words when can intercourse lead to least chance of pregnancy? Feel free to check with your older friends, doctors, nurses, or anyone who you feel comfortable talking about this.arrow_forwardIn creating male contraceptives, what steps in fertilization might be possible to block to produce contraceptives in males?arrow_forwardListed in the table below are the five major reproductive hormones that support ovulation in female mammals, including the giant panda. Describe the role of each hormone in this process and the approximate time during the ovarian cycle that it reaches peak levels. Hormone Gonadotropin-releasing hormone (GnRH) Estrogen Luteinizing hormone (LH) Follicle stimulating hormone (FSH) Progesterone Role in Regulation of the Menstrual Cycle Timing of Peak Levelarrow_forward
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