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Biology Laboratory Manual, 6/e

Darrell S. Vodopich, Baylor University
Randy Moore, University of Minnesota--Minneapolis

Exercise 49 - Embryology

Choose the one answer that best answers the question.


1	In which stage of development does a zygote go through the structural and functional specialization of groups of cells?
		A)	growth
		B)	differentiation
		C)	morphogenesis
		D)	fertilization


2	What is fertilization?
		A)	The fusion of male and female gametes.
		B)	The division of the zygote into a larger and larger number of smaller cells.C: The continued division of cells that move inward to form three cellular layers.
		C)	The development of pattern, shape, and form.


3	What is the term for eggs that have only a small amount of yolk that are evenly distributed?
		A)	holoblastic
		B)	telolecithal
		C)	isolecithal
		D)	morula


4	The hollow sphere of cells is called a _____.
		A)	morula
		B)	blastula
		C)	blastocoel
		D)	blastomeres


5	Which of the following is a germ layer formed during gastrulation?
		A)	ectoderm
		B)	mesoderm
		C)	endoderm
		D)	all of the above


6	Because the fertilized egg of frogs has most of the yolk at the _____ pole, it is said to be ____.
		A)	animal, telolecithal
		B)	animal, isolecithal
		C)	vegetal, telolecithal
		D)	vegetal, isolecithal


7	Unlike the sea star gastrula, the frog does not invaginate, but produces a ____.
		A)	blastopore
		B)	gray crescent
		C)	blastocoel
		D)	primitive streak


8	Which of the following are characteristics of reptile eggs?
		A)	protective shells
		B)	large amount of yolk
		C)	intricate membrane system
		D)	all of the above


9	Which structure in the bird egg functions to remove waste?
		A)	amnion
		B)	yolk sac
		C)	allantois
		D)	chorion


10	Which structure in the bird egg corresponds to the 'egg white' used in cooking?
		A)	shell
		B)	albumen
		C)	yolk
		D)	nucleus

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