Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 39, Problem 4TY
Summary Introduction
Introduction:
The mode of reproduction in which fusion or also known as syngamy of male and female gamete takes place outside the female body is known as external fertilization. It occursin an external medium like water. For example, fish, starfish, frogs, etc.
Internal fertilizationis the mode of reproduction in whichthe fusion of male and female gamete that occurs within the female body. For example, humans, birds, reptiles.
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Students have asked these similar questions
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
How many gametes does the male produce per day? The female per month? How does this help in the perpetuation of the species? (The function of the reproductive system in nature is the perpetuation of the species (plants, bugs, fish, mammals, birds, humans, etc. etc.)).
Which of the following does not contribute to genetic variation in sexual life cycles?
independent assortment
random fertilization
crossing over
alternation of generations
Chapter 39 Solutions
Principles of Biology
Ch. 39.1 - Choose the correct statement. The majority of...Ch. 39.2 - In _________ gametes are released in large numbers...Ch. 39.2 - In which way is gametogenesis similar in males and...Ch. 39.3 - Prob. 1CCCh. 39.3 - Prob. 1TYKCh. 39.3 - Prob. 2TYKCh. 39.4 - Prob. 1BCCh. 39.4 - Prob. 2BCCh. 39.4 - Prob. 1CCCh. 39.4 - Prob. 1TYK
Ch. 39.4 - Prob. 2TYKCh. 39.5 - The three germ layers of triploblasts are...Ch. 39.5 - Choose the correct sequence of events. cleavage...Ch. 39.6 - Under what condition(s) might you expect temporary...Ch. 39.6 - Prob. 2TYKCh. 39 - Prob. 1TYCh. 39 - Prob. 2TYCh. 39 - Spermatogonia are haploid germ cells. d. have...Ch. 39 - Prob. 4TYCh. 39 - Prob. 5TYCh. 39 - Prob. 6TYCh. 39 - A major function of FSH is to stimulate the...Ch. 39 - Prob. 8TYCh. 39 - Prob. 9TYCh. 39 - Cells of the neural crest give rise to the central...Ch. 39 - Prob. 1CCQCh. 39 - Prob. 2CCQCh. 39 - Prob. 3CCQCh. 39 - Describe the major events in animal development...Ch. 39 - Describe the events of the ovarian and uterine...
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- Besides 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_forwardLiving organisms that are capable of producing both egg and sperm have both male and female reproductive organs are gonochoric are hermaphroditic both A and C are correctarrow_forwardIs this true or false? a. Fertilization is followed by a cleavage, a period of rapid cell division without growth. b. From the process above, this results in the production of a large number of cells called blastomeres. c. In sexual reproduction, the offspring have the same combinations of genes as their parents. d. Sequential hermaphroditism occurs when an animal is one sex during one phase of its lifecycle and the opposite sex during another phasearrow_forward
- Why does asexual reproduction disadvantageous? * It takes time and energy to find a mate and reproduce. No answer Both A and B Low genetic diversity means susceptibility to diseases Fewer offspring are typically produced.arrow_forwardIn frog neurulation the notochord _______ the formation of the _______ in the ectoderm next to it. Group of answer choices expresses, neural plate induces, neural plate induces, somites expresses, somitesarrow_forwardIn species with environmental sex determination, a. sex is determined during development as an embryo. b. environmental conditions determine the sex of an individual. c. hermaphroditism always occurs. d. Both a and b are correct.arrow_forward
- Fill in the blank: The cell resulting from fertilization is called a(an) ___________________.arrow_forwardIn fertilization, select answer a male gamete and a female gamete two female gametes two male gametes fuse to produce a select answer zygote female germ cell male germ cellarrow_forwardWhich of the following statements is incorrect? a) Sperm occur as X- or Y-chromosome bearing gametes b) The sex of an individual can not be determined from morphology early in embryonic development c) It is the ovum which determines the sex of the newly developing embryo d) X-chromosome bearing sperm are slightly larger than Y-chromosome bearing spermarrow_forward
- Figure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estrogen are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.arrow_forwardDescribe the two events that are common to all sexually reproducing organisms and how they fit into the different life cycles of those organisms.arrow_forwardThenumber of eggs laid by a female is called her:a.fertility.b.gonadosomatic index.c.growth form.d.rotundity.e.fecundity.arrow_forward
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