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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Compared to separate sexes and assuming self-fertilizing is not possible, what might be one advantage and one disadvantage to hermaphroditism?
Contrast the biological advantages of hermaphroditism that involves cross-fertilization with hermaphroditism that involves self-fertilization.
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.
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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- 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 eggarrow_forwardDefine the terms dioecious and monoecious. Can either of these terms be used to describe a hermaphrodite?arrow_forwardDescribe what sexual dimorphism is and why its existence is puzzling.arrow_forward
- What is Asexual reproduction? Explain kindlyarrow_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_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_forward
- In creating male contraceptives, what steps in fertilization might be possible to block to produce contraceptives in males?arrow_forwardDefine the two alternatives of bisexual reproduction-parthenogenesis and hermaphroditism, and give a specific example from the animal kingdom for each. Also differentiate meiotic and ameiotic parthenogenesis.arrow_forwardWhy does corpus luteum stay active throughout pregnancy and in the absence of fertilization, is active only for 10-12 days?arrow_forward
- Which of the following is TRUE about the mechanism of sex determination? A) The product of the SRY gene converts the bipotential gonads into testes. B) The development of an ovary is conditioned by the presence of two X chromosomes. (C) Testosterone promotes the degeneration of the Mullerian duct. D. The ovary produces a Wolffian inhibition factor that causes the Wolffian duct to degenerate. E) The "feminization" of accessory sex orgarts is promoted by the ovary.arrow_forwardFigure 43.15 Which of the following statements about hormone regulation of the female reproductive cycle is false? LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. Both progesterone and estradiol are produced by the follicles. Secretion of GnRH by the hypothalamus is inhibited by low levels of estradiol but stimulated by high levels of estradiol.arrow_forwardBesides producing gametes (sperm and eggs), the primary male and female reproductive organs also produce sex hormones. The _____ and the pituitary gland control secretion of both.arrow_forward
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