CAMPBELL BIOLOGY IN FOCUS (LL)-W/MOD.MA
3rd Edition
ISBN: 9780135686065
Author: Urry
Publisher: PEARSON
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Chapter 36.1, Problem 2CC
Summary Introduction
To determine:
The presence of variation in offsprings if self-fertilization takes place in hermaphrodite.
Introduction:
A hermaphrodite is an animal, or plant or animal having both male and female sex organ and self-fertilization takes place by the fusion of male and female gametes from same individual.
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WHAT IF? Why did the researchers split each female frog’s eggs into twobatches for fertilization by different males? Why didn’t they mate each femalewith a single male frog?
Let's Check
Activity 9. Let us try to check your understanding of the discussion. Read the questions
carefully. Encircle the letter that corresponds to the correct answer.
1. Which of the following pairs share 50% of their genes?
Any two siblings
A pair of dyzogotic twins
A pair of monozygotic twins
a and b
2. Regarding types of multiple pregnancy, which of the following are true?
a. Dizygotic twins result from fertilization of different oocytes by the same sperm.
b. Monozygotic twins result from mitotic division of a single zygote into 'identical' twins.
c. Dizygotic twins result from the division of a single fertilized egg.
d. Monozygotic twins result from 2 egg cells merged together, eventually fertilized by a sperm
cell.
3. Fraternal twins make up approximately.
of the twin population.
Explain further each number.
What are the 4 major events comprising the process of fertilization?
What are the strategies employed by animals for success of the egg meeting the sperm?
Chapter 36 Solutions
CAMPBELL BIOLOGY IN FOCUS (LL)-W/MOD.MA
Ch. 36.1 - Prob. 1CCCh. 36.1 - Prob. 2CCCh. 36.1 - MAKE CONNECTIONS What examples of plant...Ch. 36.2 - Prob. 1CCCh. 36.2 - Why might using a hot tub frequently make it...Ch. 36.2 - Prob. 3CCCh. 36.2 - WHAT IF? If each vas deferens in a male was...Ch. 36.3 - Prob. 1CCCh. 36.3 - How does an estrous cycle differ from a menstrual...Ch. 36.3 - Prob. 3CC
Ch. 36.4 - Prob. 1CCCh. 36.4 - Prob. 2CCCh. 36.4 - Prob. 3CCCh. 36 - Prob. 1TYUCh. 36 - The cortical reaction of sea urchin eggs functions...Ch. 36 - Prob. 3TYUCh. 36 - Prob. 4TYUCh. 36 - Prob. 5TYUCh. 36 - For which is the number the same in males and...Ch. 36 - Prob. 7TYUCh. 36 - Prob. 8TYUCh. 36 - FOCUS ON EVOLUTION Hermaphroditism is more often...Ch. 36 - Prob. 10TYUCh. 36 - Prob. 11TYU
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In vertebrate animals, spermatogenesis and oogenesis differ, in that 1.) Cytokinesis is unequal in oogenesis whereas it i equal in spermatogenesis 2.) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born 3.) Oogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatozoon 4.) Oogensis ends at menopause. Whereas spermatogenesis is finished before birth 5.) Oogensis begins at the onset of sexual maturity whereas spermatogenesis happens in embryonic developmentarrow_forwardThe 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_forwardIn comparing external and internal fertilization, what evolutionary change can be seen in the coats of ovulated eggs? Why? What about the sperm? Any changes?arrow_forward
- N Question How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?arrow_forwardHello What is pseudohermaphrodite? What is the difference between female and male pseudohermaphrodism?arrow_forward.What type of abnormality in the sperm that fertilizes a normal egg will produce an XYY zygote? What process can lead to the formation of this abnormal gamete?arrow_forward
- WHAT IF? If a sperm nucleus is injected into an oocyte,what steps of gametogenesis and conception arebypassed?arrow_forwardExplain further each number 1. Compare and contrast the sequence of fertilization events that take place in the sea urchin vs. mammals. 2. How do the sperm and egg recognize each other? What molecules are involved?arrow_forwardThere are 6 major events in fertilization. Discuss the process of fertilization or conception, with emphasis on the sperm-egg interaction. Proteins on the sperm plasma membrane bind to ZP3 molecules within the zona pellucida of the egg. Why is this event important? Zona binding triggers the acrosome reaction, in which the sperm plasma membrane fuses with the outer acrosomal membrane, causing exocytosis of acrosomal contents. What is in the "acrosomal content"? Acrosomal enzymes begin to dissolve a hole in the zona pellucida. This enzymatic degradation, accompanied by rapid sperm tail beating, moves the sperm through the zona. Where does the sperm intend to reach?arrow_forward
- 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?arrow_forwardA: Why do sea urchins have external fertilization? [Discuss the life style of the developing sea urchin embryo in the water column compared to a very different ecological niche of the adults on the ocean floor. Besides, would you want to give live birth to a sea urchin! ouch!] 2: Then why don't the parents take care of the young? [In fact the adults do in a way. After the embryo has grown large enough and metamorphosed into a young urchin they hide in the spines of the adults, living off of the scraps of food produced from the messy eating of the adults] 3: Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?arrow_forwardDo all dioecious species have a homogametic and a heterogametic sex? 1. Yes, because dioecious means that two types of gametes are produced, even in hermaphroditic species. 2. Yes, because all sex-determining systems include heterogametic and homogametic sexes. 3. Yes, because in dioecious organisms, either the XX-XY or the ZZ-ZW system determines sex. XY and ZW individuals are heterogametic. XX and ZZ individuals are homogametic. 4. No, because hermaphrodites and species that reproduce asexually are dioecious. 5. No, because dioecious means that the sexes are separate, regardless of how sex is determined. In some dioecious species, sex is determined by a single gene.arrow_forward
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