BIOLOGY -TEXT
14th Edition
ISBN: 9781260710878
Author: Mader
Publisher: RENT MCG
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Textbook Question
Chapter 41, Problem 4TC
Female athletes who train intensively often stop menstruating. The important factor appears to be the reduction of body fat below a certain level. Give a possible evolutionary explanation for a relationship between body fat in females and reproductive cycles.
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Mammalian sperm don’t live very long after ejaculation.Therefore, for a rhino cow to become pregnant, the sperm must be placed in her vagina or uterus, whether by mating or by artificial insemination, at about the same time that ovulation occurs.The simplest way to ensure correct timing is to induce ovulation and have mating or artificial insemination the same day. How might ovulation be induced, in rhinos or in other mammals?
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reaches peak levels.
Hormone
Gonadotropin-releasing
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Estrogen
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Progesterone
Role in Regulation of the Menstrual Cycle Timing of Peak Level
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 41 Solutions
BIOLOGY -TEXT
Ch. 41.1 - Prob. 1CYPCh. 41.1 - Prob. 2CYPCh. 41.1 - Prob. 3CYPCh. 41.2 - Trace tie pathway a sperm must follow from its...Ch. 41.2 - Prob. 2CYPCh. 41.2 - Prob. 3CYPCh. 41.3 - Name the structures of the female reproductive...Ch. 41.3 - Explain the effects of FSH and LH on the ovarian...Ch. 41.3 - Summarize the roles of estrogen and progesterone...Ch. 41.4 - Some biomedical ethicists are concerned that...
Ch. 41.4 - Prob. 1NS.2QCCh. 41.4 - Prob. 1CYPCh. 41.4 - Prob. 2CYPCh. 41.4 - Prob. 3CYPCh. 41.5 - Prob. 1BS.1QCCh. 41.5 - Prob. 1BS.2QCCh. 41.5 - Prob. 1BS.3QCCh. 41.5 - Prob. 1CYPCh. 41.5 - Prob. 2CYPCh. 41.5 - Identify a serious condition that can occur in...Ch. 41 - Compare the anatomy of the male and female...Ch. 41 - Prob. 3TCCh. 41 - Female athletes who train intensively often stop...
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- Mate guarding is an evolved response to sperm competition. Chimpanzee (Pan troglodytes) females regularly mate with several males in the same estrous cycle, whereas gorilla (Gorilla gorilla) females almost never do, since they typically live in bands, each controlled by a single, powerful male. How large (as a proportion of body size) should the testes of chimpanzee males be relative to gorilla testes (Harcourt et al. 1981)? If the testes of men are more similar to those of chimpanzees, what would this tell us about the intensity of sperm competition during our evolutionary past? If, on the other hand, human testes resemble those of gorillas, what conclusion is justified? Please don't write from any online source.arrow_forwardWhich of the following statements does NOT correctly describe a difference between the male and female reproductive systems? Select one: a. Testosterone has a major role in the development of secondary sexual characteristics in male reproductive systems, whereas LH promotes the development of secondary sexual characteristics in females. b. The male reproductive system mass produces large quantities of gametes each day, whereas the female reproductive system produces an average of a single gamete each month. c. The excretory and reproductive systems both use the urethra in males, whereas in females, there are separate tubes for the excretory and reproductive systems. d. The structures that produce gametes are exterior to the body in the male reproductive system, whereas the gametes are produced inside the body for females.arrow_forwardClownfish are protandrous hermaphrodites. Determine whether the following features are encoded by the clownfish genome or are influenced by the proteome in response to the environment. The juvenile clownfish has both male and female immature reproductive organs. Clownfish are able to produce both testosterone and 17-estradiol. Genome encoded Increased estradiol levels lead to increased levels of proteins that promote the growth of female sex organs. Increased testosterone levels lead to increased - levels of proteins that cause male sex organs to develop Proteome influencedarrow_forward
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