Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 49, Problem 2ITD
Summary Introduction
To review:
The effects of aging, smoking, and STDs (sexually transmitted disease) on sperm count due to the regional difference in these variables.
Introduction:
The quality of semen depends upon the number of sperms present, shape of the sperms, and the motility of the sperms. Sperm count is the number of spermatozoa or sperms present per ejaculation. The sperm count is affected by many factors that include aging, smoking, and STDs. Males with low sperm count may get diabetes, heart stroke, and other problems.
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Which of the following statements about reproduction in humans is correct?
(a) Fertilisation takes place externally.
(b) Fertilisation takes place in the testes.
(c) During fertilisation egg moves towards the sperm.
(d) Fertilisation takes place in the human female.
Fishes and some species of amphibians like frogs fertilize their eggs outside of their body. Which of the following statements is TRUE about external fertilization? *
A small number of gametes need to be produced by the male and female to ensure reproductive success
It produces a small number of offspring compared to internal fertilization
A body of water is not required
no answer
Chances of fertilization are diminished by environmental hazards and Predators
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…
Chapter 49 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 49.1 - Prob. 1SBCh. 49.2 - What are egg coats, and what is their function?...Ch. 49.2 - Prob. 2SBCh. 49.3 - Outline the roles of follicle-stimulating hormone...Ch. 49.4 - How does the oral contraceptive pill prevent...Ch. 49 - Prob. 1TYKCh. 49 - Which of the following processes does not increase...Ch. 49 - Prob. 3TYKCh. 49 - Prob. 4TYKCh. 49 - The slow block to polyspermy: a. is caused by a...
Ch. 49 - Prob. 6TYKCh. 49 - Prob. 7TYKCh. 49 - Prob. 8TYKCh. 49 - Prob. 9TYKCh. 49 - Prob. 10TYKCh. 49 - Prob. 11TYKCh. 49 - Prob. 12TYKCh. 49 - Prob. 13TYKCh. 49 - Prob. 14TYKCh. 49 - Prob. 15TYKCh. 49 - Prob. 16TYKCh. 49 - Prob. 17TYKCh. 49 - Prob. 18TYKCh. 49 - Prob. 1ITDCh. 49 - Prob. 2ITDCh. 49 - Prob. 3ITD
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- Birth Defects and Multiple Births A woman who carries multiple offspring at the same time increases the risk of some birth defects. FIGURE 42.18 shows the results of Yiwei Tang's study of birth defects reported in Florida from 1W6 to 2000. Tang compared the incidence of various defects among single and multiple births. She calculated the relative risk for each type of defect based on type of birth, and corrected for other differences that might increase risk such as maternal age, income, race, and medical care during pregnancy. A relative risk of less than 1 means that multiple births pose less risk of that defect occurring. A relative risk greater than 1 means multiples are more likely to have a defect. FIGURE 42.18 Prevalence, per 10,000 live births, of various types of birth defects among multiple aria single births. Relative risk for each defect is given after researches adjusted for the motor's age, race, previous adverse pregnancy experience, education, Medicaid participation during pregnancy, as well as the infant's sex and number of siblings. 4. Does a multiple pregnancy increase the relative risk of chromosomal defects in offspring?arrow_forwardWhich of the following statements regarding the formation of human twins is INCORRECT? a. Nearly all identical twins form before the 9th day following fertilization. b. Identical twins share an umbilical cord. c. Fraternal twins form after two eggs become fertilized. d. Identical twins form after two eggs become fertilized.arrow_forwardFill in the following table with the words from the list below. ovary | B. oviducts | C. vagina |D. uterus | Urogenital Sinus _________ 1. where gestation occurs _________ 2. copulatory organ and part of the birth canal _________ 3. extremely small tubes on the surface of each ovary where fertilization may occur _________ 4. chamber formed by the fusion of the vagina and urethra _________ 5. female gonad which produces eggs and female sex hormones.arrow_forward
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