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Chapter 47: Problem 4

The animal group that exhibits external fertilization is the: a. amphibians. b. birds. c. sharks. d. reptiles. e. mammals.

Short Answer

Expert verified
The correct answer is a. amphibians.

Step by step solution

01

Understanding the concepts

First it's important to understand the concepts of internal and external fertilization. Internal fertilization occurs when sperm and an egg combine inside of an animal's body. External fertilization, on the other hand, is the process of fertilization that takes place outside of the body. Many aquatic and some terrestrial species are known to use external fertilization.
02

Identifying the animals' method

Next, by using general knowledge about the different animal groups, mark down which animals most likely use external fertilization. Birds, sharks, reptiles and mammals are known for internal fertilization. This leaves amphibians, which are known to use external fertilization in many species, like frogs and toads. Thus, the correct answer should be amphibians.

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Most popular questions from this chapter

Which of the following processes does not increase genetic diversity? a. parthenogenesis. b. random DNA mutations. c. genetic recombination. d. independent assortment. e. random combinations of paternal and maternal chromosomes.

The most effective method to prevent fertilization is: a. the oral contraceptive. b. the IUD. c. the morning-after pill. d. vasectomy and tubal ligation. e. the rhythm method.

Gametogenesis has parallel stages in egg and sperm formation. The stage in eggs that is equivalent to spermatids is the: a. primary oocyte. b. oogonium. c. ovum. d. ootid and polar bodies. e. secondary oocyte and polar body.

During spermatogenesis in mammals, sperm travels from the: Sertoli cells past the epididymis and urethra, through the vas deferens to the prepuce. b. seminal vesicles past the prostate gland, through the glans and prepuce to the bulbourethral glands. c. vestibular glands past the Leydig cells, through the accessory glands and epididymis to the vas deferens. d. labia past the bulbourethral glands, through the vas deferens and urethra to the epididymis. e. seminiferous tubules past the Leydig cells, through the epididymis and vas deferens to the urethra.

The slow block to polyspermy: a. is caused by a change in membrane potential from negative to positive. b. triggers the movement of \(\mathrm{Ca}^{2+}\) from the cytosol to the endoplasmic reticulum. c. triggers a decrease in egg oxidation and protein synthesis. describes the fusion of egg and sperm nuclei. e. includes the fusion of cortical granules with the egg's plasma membrane.
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